TWENTIETH CENTURY ZOOLOGY. 
Animal Life. 
A First Book of Zodlogy. By President Davip STARR 
Jorpan and VEeRNoN L. KELLoGG, M.S., Professor of 
Entomology in Leland Stanford Junior University. 12mo. 
Cloth, $1.20. 
‘T believe it is an excellent thing, filling a gap that has long been 
apparent in our nature work in this country."—Prof. Lawrence 
Bruner, University of Nebraska. 
“Your book is certainly an admirable discussion of biological 
problems up to date. It is interesting, and stimulative of thought and 
observation.” —LZ/hott R. Downing, University of Chicago. 
“The ecological treatment of zodlogy here finds a truly successful 
exhibition, and it is certainly very satisfactory and ahead of all 
previous attempts at a similar exposition for beginners in zodlogy.”— 
Prof. Julius Nelson, Rutgers College. 
“Tt is by far the best text-book on zodlogy yet published for the 
use of high-school students. It breathes the freshness of nature. 
Fortunate is the school that is permitted to use it.”"—Principal W. N. 
Bush, Polytechnic High School, San Francisco, Cal. 
Animal Forms. 
By President Davip Starr JORDAN and Haro.ip 
Heatu, Ph.D., Professor of Zodélogy in Leland Stanford 
Junior University. 12mo. Cloth, 
“ Animal Forms” deals similarly with animal morphology, structure 
and life processes, from the lowest, simplest, one-celled creations to the 
highest and most complex. The two complete a full year’s work in 
zoology. 
The first chapter defines zodlogy, and explains minutely the 
morphology of a typical animal. The second chapter discusses cells 
and protoplasm, and prepares the pupil for an intelligent and logical 
study of the general subject. 
In simplicity of style, in correctness of scientific statement, in pro- 
fuseness and perfectness of illustration, these books are without a peer. 
A Laboratory Manual is in preparation. Teachers’ Manuals free. 
D. APPLETON AND COMPANY, NEW YORK. 
