The Twentieth Century Text Books of Biology. 
PLANT RELATIONS, 12mo, cloth $1.10 
PLANT STRUCTURES, 12mo, cloth 1.20 
PLANT STUDIES, l2mo, 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 Nat tire, their relations to o?ie 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 , LL. D , and HAROLD HEATH, Ph. D., 
Professor in Leland Stanford Junior University. Ready in February , jqoi . 
D. APPLETON AND COMPANY, Publishers, Neiv 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 Swarthmore ; 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 Drs. Hewes, of Harvard Lhiiversity; 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 John Hopkins. Nine volumes ready. 
The publishers cordially invite correspondence. 
AMERICAN BOOK COMPANY, Cincinnati 
