Chemical Chart:
BY E. L. YOUMANS.
On Rollers, 5 feet by 6 in size. New Edition. Price $5.
This popular work accomplishes for the first time, for Chemistry, what maps and charts have for geography, geology, and astronomy, by presenting a new and valuable mode of illustration. Its plan is to represent chemical composition to the eye by colored diagrams, so that numerous facts of proportion, structure, and relation, which are the most difficult in the science, are presented to the mind through the medium of the eye, and may thus be easily acquired and long retained. The want of such a chart has long been felt by the thoughtful teacher, and no other scientific publication that has ever emanated from the American press has met with the universal favor that has been accorded to this Chart. In the language of a distinguished chemist, "Its appearance marks an era in the progress of the popularization of Chemistry."
It illustrates the nature of elements, compounds, affinity, definite and multiple proportions, acids, bases, salts, the salt-radical theory, double decomposition, deoxidation, combustion and illumination, isomerism, compound radicals, and the composition of the proximate principles of food. It covers the whole field of Agricultural Chemistry, and is invaluable as an aid to public lecturers, to teachers in class-room recitation, and for reference in the family. The mode of using it is explained in the class-book.
From the late Horace Mann, President of Antioch College.
I think Mr. Youmans is entitled to great credit for the preparation of his Chart, because its use will not only facilitate acquisition, but, what is of far greater importance, will increase the exactness and precision of the student's elementary ideas.
From Dr. John W. Draper, Professor of Chemistry in the University of N. Y.
Mr. Youmans' Chart seems to me well adapted to communicate to beginners a knowledge of the definite combinations of chemical substances, and as a preliminary to the use of symbols, to aid them very much in the recollection of the examples it contains. It deserves to be introduced into the schools.
From James B. Rogers, Professor of Chemistry in the University of Pennsylvania.
We cordially subscribe to the opinion of Professor Draper concerning the value to beginners of Mr. Youmans' Chemical Chart.
JOHN TORREY, Professor of Chemistry in the College of Physicians & Surgeons, N. Y.
WM. H. ELLET, Late Professor of Chemistry in Columbia College, S. C.
JAMES B. ROGERS, Professor of Chemistry in the University of Pennsylvania.
From Benjamin Silliman, LL. D., Professor of Chemistry in Yale College.
I have hastily examined Mr. Youmans' New Chemical Diagrams or Chart of chemical combinations by the union of the elements in atomic proportions. The design appears to be an excellent one.