The Twentieth Century Text Books of Biology, 
PLANT RELATIONS, l2mo, cloth $1.10 
PL, ANT STRUCTURES, 12mo, cloth 1.20 
PLANT STUDIES, 12mo, cloth 1.20 
PLANTS, 12mo, cloth ..... . . . 1.80 
ANALYTICAL KEY TO PLANTS, 12mo, flexible cloth . . .75 
All by JOHN MERLE COULTER, A M., Ph. D., Head of Dept, of Botany, University of Chicago. 
They are already the preferred texts , and the 
reasons will be apparent on examination. 
ANIMAL LIFE : A First Book of Zoology. 
By DAVID S. JORDAN, M. S., M. D , Ph. D., LL. D., President of the Leland Stanford Jun- 
ior University, and VERNON L. KELLOGG, M. S., Professor in Leland Stanford Junior 
University. 12mo. Cloth, $1.20. Now ready. 
Not a book for learning the classification, anatomy , and nomenclature af animals, but to 
show how animals reached their present development , the effects of environment, their place 
in Nature, their relations to one another and to the human race . Designed for one-half 
year' s work in high schools. Send for sample pages. 
ANIMAL FORMS : A Second Book of Zoology. 
By DAVID S. JORDAN, M. S., M. D., Ph D , LI., D., and HAROLD HEATH, Ph. D., 
Professor in Leland Stanford Junior University. Ready in February , igoi. 
D. APPLETON AND COMPANY, Publishers, New York , Chicago, London. 
Recent Scientific Works 
TN Astronomy, Dr. Simon Newcomb’s new book, pub- 
lished October, 1900; in Physics, the Johns Hopkins 
text of Professors Rowland and Ames; also in Physics 
for second and third year high school work, the text 
of Dr. Hoadley, of Swartlimore; in Physiology, the text 
by Drs. Macy and Norris, based on the Nervous System; 
also the High School Physiology indorsed by the W. C. 
T. U., written by Dr. Hewes, of Harvard University; in 
Geology, the Revised “ Compend” of Dr. Le Conte, and 
the two standard works of Dana, — The Manual for Uni- 
versity Work, and the New Text Book, revision and 
rewriting of Dr. Rice, for fourth year high school work; 
in Chemistry, the approved Storer and Lindsay, recom- 
mended for secondary schools by the leading colleges; 
in Zoology, the Laboratory Manual of Dr. Needham, of 
Cornell; and the Series “Scientific Memoirs” edited by 
Dr. Ames, of Johns Hopkins. Nine volumes ready. 
The publishers cordially invite correspondence. 
AMERICAN BOOK COMPANY, Cincinnati 
