SCIENCE TEXT-BOOKS.

D. Appleton & Co. have the pleasure of announcing that in response to the growing interest in the study of the Natural Sciences, and a demand for improved text-books representing the more accurate phases of scientific knowledge, and the present active and widening field of investigation, they have made arrangements for the publication of a series of text-books to cover the whole field of science-study in High Schools, Academies, and all schools of similar grade.

The author in each separate department has been selected with regard to his especial fitness for the work, and each volume has been prepared with an especial reference to its practical availability for class use and class study in schools. No abridgment of labor or expense has been permitted in the effort to make this series worthy to stand at the head of all educational publications of this kind. Although the various books have been projected with a view to a comprehensive and harmonious series, each volume will be wholly independent of the others, and complete in itself.


NOW READY.

THE ELEMENTS OF CHEMISTRY. By Professor F. W. Clarke, Chemist of the United States Geological Survey. 12mo. Cloth, $1.50.

THE ESSENTIALS OF ANATOMY, PHYSIOLOGY, AND HYGIENE. By Roger S. Tracy, M.D., Health Inspector of the New York Board of Health; author of "Hand-Book of Sanitary Information for House-holders," etc. 12mo. Cloth, $1.25.

A COMPEND OF GEOLOGY. By Joseph Le Conte, Professor of Geology and Natural History in the University of California; author of "Elements of Geology," etc.

ELEMENTS OF ZOOLOGY. By C. F. Holder, Fellow of the New York Academy of Science. Corresponding Member Linnæan Society, etc.; and J. B. Holder, M. D., Curator of Zoölogy of American Museum of Natural History, Central Park, New York.

DESCRIPTIVE BOTANY. A Practical Guide to the Classification of Plants with a Popular Flora. By Eliza A. Youmans, author of "The First Book of Botany," editor of "Henslow's Botanical Charts." 12mo. Cloth, $1.50.

Other volumes to follow as rapidly as they can be prepared.

New York: D. APPLETON & CO., 1, 3, & 5 Bond Street.