TWENTIETH CENTURY ZOOLOGY. 

 Animal Life. 



A First Book of Zoology. By President David Starr 

 Jordan and Vernon L. Kellogg, M. S., Professor of 

 Entomology in Leland Stanford Junior University. i2mo. 

 Cloth, $1.20. 



"I 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." — Elliott R. Downing, University of Chicago. 



" 'Ihe ecological treatment of zoology 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 zoology." — 

 Prof. Julius Nelson, Rntgers College. 



" It is by far the best text-book on zoology 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 David Starr Jordan and Harold 

 Heath, Ph.D., Professor of Zoology in Leland Stanford 

 Junior University. i2mo. Cloth, $1.10. 



" 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 zoology, and explains minutely the 

 morphology of a typical animal. The second chajiter 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. 



