Fig. 2 Whelk (Buccinum umatum) Fig. 3 Pond snail (Lymnaea palustris)
The principal fresh-water snails are the pond snail (Lymnaea; see Fig. 3); the Physa (see Fig. 6), which is remarkable for having the coil turned to the left instead of the right; and the orb-snail, (Planorbis: see Fig. 4) which has its coil flat. All of {96} these lay minute eggs in a mass of transparent jelly, and are to be found on lily pads and other water plants, or crawling on the bottom, while the mussels bury themselves more or less in the mud or lie on the gravelly bottom of streams. There is also a very numerous tribe of small bivalve shells, varying from half an inch to very minute in size, which are also mud lovers and are known as Sphaerium or Pisidium, having no
"common" English names, since only those who hunt for them know of their existence.
On the seashore everybody knows the mussel (Mytilus: see Fig. 5), the soft clam, the round clam, and the oyster, as these are sought for food; but there is a multitude of smaller bivalves which are not so well known. The sea-snails best known on the coast north of Chesapeake Bay are the whelk (Buccinum: see Fig. 2), the sand snail or Natica, which bores the round holes often found in clam shells on the beach, in order to suck the juices of its neighbors, and the various kinds of periwinkles (rock snails or Littorina) found by the millions on the rocks between tides. These, as well as the limpets, small boat-shaped or slipper-shaped conical shells found in similar places, are vegetable feeders. Altogether, there are several hundred kinds found on the seashore and the water near the shore, and a collection of them will not only contain many curious, pretty, and interesting things, but will have the advantage of requiring no preservative to keep them in good condition after the animal has been taken out.
Fig. 4 Orb-Shell (Planorbis trivolvis) Fig. 5 Black Mussel (Mytilus) Fig. 6 Bubble snail (Physa heterostropha) The squids, cuttle-fishes, octopus, and their allies are also mollusks, but not so accessible to the ordinary collector, and can only be kept in spirits.
Books which may help the collector to identify the shells he may find are:
For the land and fresh-water shells:
{97}
"Mollusks of the Chicago Area" and "The Lymnaeidae of North America." By F. C. Baker. Published by the Chicago Academy of Sciences.
For the American Marine Shells: Bulletin No. 37. Published by the United States National Museum, at Washington.
For shells in general: "The Shell Book." Published by Doubleday, Page & Co., Garden City, N.Y.
On the Pacific Coast the "West Coast Shells," by Prof. Josiah Keep of Mills College, will be found very useful.
REPTILES By Dr. Leonhard Stejneger, Curator National Museum By reptiles we understand properly a certain class of vertebrate or backboned animals, which, on the whole, may be described as possessing scales or horny shields since most of them may be distinguished by this outer covering, as the mammals by their hair and the birds by their feathers. Such animals as thousand-legs, scorpions, tarantulas, etc., though often erroneously referred to as reptiles, do not concern us in this connection. Among the living reptiles we distinguish four separate groups, the crocodiles, the turtles, the lizards, and the snakes.
The crocodiles resemble lizards in shape, but are very much larger and live only in the tropics and the adjacent regions of the temperate zone. To this order belongs our North American alligator, which inhabits the states bordering the Gulf of Mexico and the coast country along the Atlantic Ocean as far north as North Carolina. They are hunted for their skin, which furnishes an excellent leather for traveling bags, purses, etc., and because of the incessant pursuit are now becoming quite rare in many localities where formerly they were numerous. The American crocodile, very much like the one occurring in the river Nile, is also found at the extreme southern end of Florida.
The turtles are easily recognized by the bony covering which encases their body, and into which most species can withdraw their heads and legs for protection. This bony box is usually covered with horny plates, but in a large group, the so-called soft-shell turtles, the outer covering is a soft skin, thus forming a {98} notable exception to the rule that reptiles are characterized by being covered with scales or plates. While most of the turtles live in fresh water or on land, a few species pass their lives in the open ocean, only coming ashore during the breeding season to deposit their eggs. Some of these marine turtles grow to an enormous size, sometimes reaching a weight of over eight hundred pounds. One of them is much sought for on account of the delicacy of its flesh; another because of the thickness and beauty of its horny plates which furnish the so-called tortoise-shell, an important article of commerce. Turtles appear to reach a very old age, specimens having been known to have lived several hundred years. The box tortoise of our woods, the musk turtles, the snapping turtles are familiar examples of this order, while the terrapin, which lives in brackish ponds and swamps along our sea-coasts, is famous as a table delicacy.
Harlequin snake
The lizards are four-legged reptiles, usually of small size, living on the ground or in the trees, out very rarely voluntarily entering water. The so-called water lizards are not lizards at all, but belong to the salamanders and are distinguished by having a naked body not covered with scales. Most of the true lizards are of very graceful form, exceedingly quick at running; others display the most gorgeous coloration which, in many of them, such as the chameleons, changes according to the light, or the temperature, or the mood of the animal.
Not all of them have four legs, however, there being a strong tendency to develop legless species which then externally become so much like snakes that they are told apart with some difficulty. Thus our so-called glass-snake, common in the Southern states, is not a snake at all, but a lizard, as we may easily see by observing the ear openings on each side of the head, as no snake has ears. This beautiful animal is also known as the joint-snake, and both names have reference to the exceeding brittleness of its long tail, which often breaks in many pieces in the hands of the enemy trying to capture the lizard. That these pieces ever join and heal together is of course a silly fable. As a matter of fact, the body in a comparatively short time grows a new tail, which, however, is much shorter and stumpier than the old one. The new piece is often of a different color from the rest of the body and {99} greatly resembles a "horn," being conical and pointed, and has thus given rise to another equally silly fable, viz., that of the horn snake, or hoop snake, which is said to have a sting in its tail and to be deadly poisonous. The lizards are all perfectly harmless, except the sluggish Gila monster (pronounced Heela, named from the Gila River in Arizona) which lives in the deserts of Arizona and Mexico, and whose bite may be fatal to man. The poison glands are situated at the point of the lower jaw, and the venom is taken up by the wound while the animal hangs on to its victim with the tenacity of a bulldog. All the other lizards are harmless in spite of the dreadful stories told about the deadly quality of some of the species in various parts of the country.
Rattlesnake palate
The snakes form the last group of the reptiles. Universally legless, though some of the boas and pythons have distinct outer rudiments of hind limbs, they are not easily mistaken. And it is perhaps well so, for unless one is an expert at distinguishing between the poisonous and the harmless kind it is just as well to keep at a respectful distance from them. It is safest not to interfere with them, especially as those that are not poisonous are usually very useful in destroying rats and mice and other vermin, except perhaps those living in trees and feeding on eggs and young birds, which certainly do not deserve our protection. Of course the rattlesnake is not to be mistaken. The horny appendix to its tail, with which it sounds the warning of its presence, is enough to distinguish it. It should here be explained that both lizards and snakes at various intervals shed the outer layer of their skin, the so-called epidermis. This transparent layer, after a certain length of time, loosens and is usually stripped off whole by the animal crawling out of it and turning it inside out, as a tight glove is turned.
Now, at the end of a rattlesnake's tail there is a horny cap which is
{100} called the button, and being narrowed at the base and more strongly built than the rest of the epidermis it is not shed with the rest of the skin, but remains attached.
Thus for each shedding a new joint or ring is added to the rattle. How often the shedding takes place depends on various circumstances and may occur an uncertain number of times each year. Such a rattle, loose-jointed as it is, is rather brittle and the tip of the sounding instrument is easily broken and lost. It will therefore be easily understood that the common notion that a rattlesnake's age can be told by the number of the rings in its rattle is absolutely erroneous.
Another equally common and equally erroneous notion relates to the tongue of the snake, which the ignorant often term its "sting" and which they believe to be the death-dealing instrument. Of course, the soft, forked tongue which constantly darts out and in of the snake's mouth is perfectly harmless. It serves rather as a "feeler" than as a taste organ. The wound is inflicted by a pair of large, curved, teeth or fangs, in the upper jaw. These fangs are hollow and connected by a duct with the gland on the side of the head, in which the poison is formed. Pressure on this gland at the time of the strike--for our poisonous snakes strike rather than bite--squirts the poison into the wound like a hypodermic syringe. The fangs when shed or damaged are replaced within a short time with new ones, so that a poisonous snake can only be made harmless for a short period by breaking them off. Only in exceptional cases need snake bites prove fatal. It is estimated that in North America only about two persons in a hundred bitten are killed by the poison, though many more die from carelessness or bad treatment, the worst of which is the filling up with whiskey, which aids the poison rather than counteracts it. The essential things in case of snake bite are: (1) keeping one's wits; (2) tying a string, or the like, tightly around the wounded limb between the wound and the heart, and loosening it about once in fifteen minutes, so as to admit the poison slowly into the circulation; (3) making the wound bleed freely by enlarging it with a knife or otherwise; (4) if permanganate of potash be handy it should at once be applied to the {101} wound; (5) treat the wound as antiseptically as it is possible with the means at hand and hurry to a doctor.
Copperhead
The danger depends greatly on the amount of the poison injected, hence upon the size of the snake. It is for this reason that the big Florida rattlesnakes which grow to six feet and over are more to be feared than are other poisonous snakes. Of these, we have in our country, besides the rattlesnakes, the water moccasin, or cotton mouth, the copperhead, and the coral snake. The latter is a bright-colored snake of red, yellow, and black rings found in the South, but it is usually small, and not aggressive, so that but few cases of poisoning are known. The other two are common enough, the former from Norfolk, Va., south, the other all over the eastern country from Texas to Massachusetts. They are usually confounded, however, with two perfectly harmless snakes, the cotton mouth with the common water snake, the copperhead with the so-called spreading adder, but as their differences have to be learned from actual inspection and are very hard to express in a description which would help to identify living specimens, it is wisest to keep away from all of them.
See "The Poisonous Snakes of North America." By Leonard Stejneger, published by Government Printing office, Washington.
Water moccasin Chrysalis
INSECTS AND BUTTERFLIES United States Bureau of Entomology (Illustrations are copies from Comstock's "How to Know the Butterflies," through courtesy of D. Appleton & Company.) There is an advantage in the study of insects over most other branches of nature, excepting perhaps plants, in that there is plenty of material. You may have to tramp miles to see a certain bird or wild animal, but if you will sit down on the first patch of grass you are sure to see something going on in the insect world.
Butterflies
Nearly all insects go through several different stages. The young bird is very much like its parent, so is the young squirrel or a young snake or a {102} young fish or a young snail; but with most of the insects the young is very different from its parents. All butterflies and moths lay eggs, and these hatch into caterpillars which when full grown transform to what are called pupae or chrysalids--nearly motionless objects with all of the parts soldered together under an enveloping sheath. With some of the moths, the pupae are surrounded by silk cocoons spun by the caterpillars just before finally transforming to pupae. With all butterflies the chrysalids are naked, except with one species which occurs in Central America in which there is a common silk cocoon. With the moths, the larger part spin cocoons, but some of them, like the owlet moths whose larvae are the cutworms, have naked pupre, usually under the surface of the ground. It is not difficult to study the transformations of the butterflies and moths, and it is always very interesting to feed a caterpillar until it transforms, in order to see what kind of a butterfly or moth comes out of the chrysalis.
Take the monarch butterfly, for example: This is a large, reddish-brown butterfly, a strong flier, which is seen often flying about in the spring and again in the late summer and autumn. This is one of the most remarkable butterflies in America. It is found all over the United States. It is one of the strongest fliers that we know. It passes the winter in the Southern states as an adult butterfly, probably hidden away in cracks under the bark of trees or elsewhere. When spring comes the butterflies come out and begin to fly toward the north.
Wherever they find the milk-weed plant they stop and lay some eggs on the leaves. The caterpillars issue from the eggs, feed on the milkweed, transform to chrysalids; then the butterflies issue and continue the northward flight, stopping to lay eggs farther north on other milkweeds. By the end of June or July some of these Southern butterflies have found their way north into Canada and begin the return flight southward. Along in early August they will be seen at the summer resorts in the Catskill Mountains, and by the end of October they will have traveled far down into the Southern states where they pass the winter.
Empty chrysalis and butterfly
The caterpillar of the monarch or milkweed butterfly is a very striking creature. It is nearly two inches long when full grown. Its head is yellow striped with black; its body is white with narrow black and yellow cross-stripes on each {103} segment. On the back of the second segment of the thorax there is a pair of black, whiplash-like filaments, and on the eighth joint there is a similar shorter pair. When this caterpillar gets ready to transform to chrysalis, it hangs itself up by its tail end, the skin splits and gradually draws back, and the chrysalis itself is revealed--pale pea-green in color with golden spots.
Anyone by hunting over a patch of milkweed anywhere in the United States during the summer is quite apt to find these caterpillars feeding. It will be easy to watch them and to see them transform, and eventually to get the butterfly.
The same thing may be done with anyone of the six hundred and fifty-two different kinds of butterflies in the United States.
Larva getting ready to transform Full grown larva Moths
When it comes to moths, there is a much greater variety.
Instead of six hundred and fifty-two, there are fifty-nine hundred and seventy in Doctor Dyar's big catalogue. Perhaps the most interesting of these caterpillars are the big native silk-worms, like those of the cecropia moth, the luna moth, the polyphemus moth, or the promethia moth. These caterpillars are very large and are to be found feeding upon the leaves of different trees, and all spin strong silken cocoons.
People have tried to reel these cocoons, thinking that they might be able to use the silk to make silk cloth as with the domestic silk-worm of commerce, but they have been unable to reel them properly. The polyphemus moth, for example, has been experimented with a great deal. It is found over a greater part of the United States, and its caterpillar feeds upon a great variety of trees and shrubs such as oak, Butternut, hickory, basswood, elm, maple, birch, chestnut, sycamore, and many others. The caterpillar is light green and has raised lines of silvery white on the side. It grows to a very large size and spins a dense, hard cocoon, usually attached to leaves. There
{104} are two generations in the Southern states, and one in the Northern states. The moth which comes out of the cocoon has a wing spread of fully five inches. It is reddish-gray or somewhat buff in color with darker bands near the edge of the wings, which themselves are pinkish on the outside, and with a large clear spot near the centre of the forewing and a regular eyespot (clear in part and blue in the rest) in the centre of the hind wing.
One wishing to know about butterflies and moths should consult a book entitled, "How to Know the Butterflies," by Prof. J. H. Comstock of Cornell University and his wife, Mrs. Comstock, published by D.
Appleton & Co., of New York, or, "The Butterfly Book," by Dr. W. J.
Holland of Pittsburg, published by Doubleday, Page & Co., of New York, and "The Moth Book," also by Doctor Holland, and published by the same firm.
Caterpillar to chrysalis
Other Insects
There are many more different kinds of insects than there are of flowering plants, and if we were to add together all of the different kinds of birds, mammals, reptiles, fishes, crabs, mollusks, and all of the lower forms of animal life, they would not all together amount to so many different kinds as there are insects. This makes the classification of insects quite complicated. There are eighteen or nineteen main orders, and each one is subdivided almost indefinitely.
There is not one of these that is not full of interest. The habits of ants, for example, living in communities by themselves, afford a tremendous opportunity for interesting observation. A good book about them has been recently written by Dr. W. M. Wheeler, of Harvard, entitled "Ants, their Structure, Development, and Behavior,"
published by the Columbia University Press, New York.
{105}
Many insects live in the water, and to follow their life histories in small home-made aquaria is one of the most interesting occupations one could have, and there is a lot to be learned about these insects. Go to any stagnant pool and you will find it swarming with animal life: Larvae or "wigglers" of mosquitoes, and a number of other aquatic insects will be found, feeding upon these wigglers. Water bugs of different kinds will be found and the life histories of most of these were until quite recently almost unknown.
Beetles and Wasps
The order Coleoptera, comprising what we know as beetles, has thousands of species, each one with its own distinctive mode of life; some of them feeding upon other insects, others boring into wood, others feeding upon flowers, others upon leaves, and so on in endless variety.
The wasps also will bear study. Here, too, there is a great variety, some of them building the paper nests known to every one, others burrowing into the surface of the ground and storing up in these burrows grasshoppers and other insects for food for their young which are grub-like in form; others still burrowing into the twigs of bushes, and others making mud nests attached to the trunks of trees or to the clapboards of houses or outbuildings.
This is just a hint at the endless variety of habits of insects. The United States National Museum publishes a bulletin, by Mr. Nathan Banks, entitled "Directions for Collecting and Preserving Insects,"
which gives a general outline of the classification, and should be possessed by everyone who wishes to take up the study from the beginning.
FISHES By Dr. Hugh M. Smith, Deputy Commissioner United States Fisheries
There is no more fascinating and profitable study than the fish life of the lakes, ponds, rivers, brooks, bays, estuaries, and coasts of the United States; and no more important service can be rendered our American boys than to teach them to become familiar with our native food and game fishes, to realize their needs, and by example and precept to {106} endeavor to secure for the fishes fair consideration and treatment.
Esox lucius--Common pike pickerel Oncorhynchus tschawytscha--Chinook salmon Coregonus clupeiformis--Common whitefish Salvelinus fontinalis--Brook trout: speckled trout Ictalurus punctatus--The speckled catfish Classes of Fish Fishes may be roughly classified as (1) fresh water, (2) migratory between fresh and salt water, and (3) marine. Among the families of American fresh-water fishes that are conspicuous on account of their size, abundance, or economic importance, or all of these, there may be mentioned the sturgeons, the catfishes, the suckers, the minnows or carps, the pikes, the killifishes, the trouts, salmons, and whitefishes, the perches, and the basses, and sun fishes.
Migratory Fish
The migratory fishes fall into two groups, the anadromous and the catadtomous. The anadromous fishes pass most of their lives in the sea, run up stream only for the purpose of spawning, and constitute the most valuable of our river fishes. In this group are the shads and the alewives or river herrings, the white perch, the striped bass or rock fish, some {107} of the sturgeons, and the Atlantic salmon, all of which go back to sea after spawning, and the Pacific salmons (five species), all of which die after spawning. Of the catadromous fishes there is a single example in our waters--the common eel. It spends most of its life in the fresh waters and sometimes becomes permanently landlocked there, and runs down to the sea to spawn, laying its eggs off shore in deep water.
Marine Fish
The marine fishes that are found in the coastal waters of the United States number many hundred species, some of them of great value as food. Among the most important are cod, haddock, hake, halibut, Flounder, herring, bluefish, mackeral, weakfish or squeteague, mullet, snapper, drum, and rock fishes.
Perea flavescens--Yellow perch Pomolobus altivalis--The alewife or river herring Micropterus salmoides--Large-mouth black bass Notropis hudsonius--Minnow or shiner Acipenser oxyrhynchus--The Atlantic sturgeon
Studying Fish
The study of living fishes is most entertaining and is rendered somewhat difficult by the medium in which they live, by their
{108}shyness, and by the necessity of approaching closely in order to obtain any accurate view. The spawning, feeding, swimming and other habits of very few of our fishes are so well known that further information thereon is not needed; and the boy scout's patience, skill, and powers of observation will be reflected in the records that may be and should be kept about the different fishes met with. Fishes may be studied from a bank, wharf, or boat, or by wading; and the view of the bottom and the fishes on or adjacent thereto may be greatly improved by the use of a "water bucket"--an ordinary wooden pail whose bottom is replaced by a piece of window glass. A more elaborate arrangement for observation is to provide at the bow of a row-boat a glass bottom box over which may be thrown a hood so that the student is invisible to the fishes.
Fundulus diaphanus--Killifish: top minnow Catostomus commersonii--Common sucker: white sucker Identification of Specimens
While many of the fishes in a given section are easily recognizable, there are in every water fishes which, on account of their small size, rarity, retiring habits, or close similarity to other fishes, are unknown to the average boy. These latter fishes often afford the most interesting subjects for study; and in all parts of the country it is possible for energetic observers and collectors to add to the list of fishes already recorded from particular districts.
When fishes cannot be identified in the field, the larger ones may be sketched and notes taken on their color, while the smaller ones may be preserved with salt, formalin, or any kind of spirits. Specimens and drawings may be forwarded for identification to the zoological department of the local state university, to the state fish commission, to the Bureau of Fisheries, Washington, D. C., or to the United States National Museum in the same city.
{109}
Angling
This most delightful of outdoor pastimes requires for its enjoyment no elaborate or expensive paraphernalia: a rod cut on the spot, a cork float, an ordinary hook baited with angleworm, grasshopper, grub, may-fly, or any of a dozen other handy lures, will answer for most occasions. At the same time, the joys of fishing will often be increased if one possesses and learns how to use a light, jointed rod, with reel, fine line, and artificial baits. The necessary equipment for scientific angling is so light and compact that it should form a part of the outfit of every one who spends much time in the open air.
It should be the invariable practice of anglers to return to the water all uninjured fish that are not needed for food or study. "It is not all of fishing to fish," and no thoughtful boy who has the interests of the country at heart, and no lover of nature, will go fishing merely for the purpose of catching the longest possible string of fish, thus placing himself in the class of anglers properly known as "fish hogs."
Special Service by Boy Scouts
Valuable service may be rendered by boy scouts in all parts of the country by bringing to the attention of the proper state, county, or municipal authorities matters affecting the welfare of the fishes.
Among the subjects that should be reported to fish commissioners, fish wardens, or local legal officers are:
(1) All cases noticed where fish are being killed by dynamite, poisons, or other illegal and improper means.
(2) Threatened destruction of fish by the drying of streams or ponds.
(3) The existence of obstructions to the passage of fish on their way to their spawning grounds. All dams in streams in which are migratory fish should have fish-ways or fish-ladders.
Aquarium William Leland Stowell, M. D.
Every boy should have an aquarium. The aquarium will give ten times as much pleasure as annoyance, and the longer time you have one undisturbed the greater will be its revelations.
A simple tank can be made from a large water bottle or demijohn. File a line around the top and carefully break it off. For the back yard, cut a paint barrel in two or coat a tub inside with spar varnish. Anything that will hold a few gallons of water, two inches of clean sand, and some water plants will be a suitable home for fish and other creatures. A boy handy with tools can make a frame, and with plate glass and proper cement construct a large tank.
{110}
Starting the Aquarium
You can balance your aquarium by plenty of plants. As they grow they give off oxygen which purifies the water and is breathed by the fish. The water need not be changed for years. The swamps and slow streams afford great numbers of plants. If you know the plants get pond weeds, Canadian water weed, ludwigia, willow moss, or tape grass. (Look in the dictionary for official names of the plants or get special books from the library.) Take some tape grass (vallisneria) to your teacher or doctor and ask him to show you under his microscope how the sap flows and the green coloring matter is deposited. The simplest form of vegetation is algae which grows on the sides of the tank. Lest this grow too thick, put in a few snails. Watch the snails'
eggs develop in clusters. Buy if you cannot find banded swamp snails that give birth to their young instead of laying eggs.
Any pond or stream will furnish fish that are beautiful or interesting to watch, e.g., killies, sunfish, cat-fish, carp, shiners, blacknosed dace, minnows--the mud minnow that seems to stand on his tail--darters, etc. If you get your supply from dealers, buy gold fish, of