The Animal Behavior Series 
Under the General Editorship of ROBERT M. YERKES, 
Ph.D., Instructor in Comparative Philosophy, Harvard Uni- 
versity 
The aim of the Series is to present a number of small volumes which 
taken together shall form a comprehensive introduc- 
tion to Comparative Psychology 
NOW READY 
The Dancing Mouse 
By ROBERT M. YERKES, Ph.D. 
Cloth, r2mo, xxi + 290 pages, illus., $1.25 net 
“Dr. Yerkes’ book is a most interesting example of modern laboratory 
methods and can be read with profit by any one, on account of the 
accurate methods of observation and careful deductive reasoning 
which it shows. An elaborate, painstaking system of experiments 
was carried on with over 400 mice, with the object of determining 
muscular coérdination, structural peculiatities, strength of the special 
sense organs, habit formation, educability, and strength of memory of 
these little animals. Some experiments were also undertaken along 
the line of inherited peculiarities. ... The work is really only a 
preliminary study, but it will be read with much interest by all 
students of comparative psychology.” — Journal of American Medical 
Association. 
The Animal Mind 
By MARGARET FLOY WASHBURN, Ph.D., Professor 
of Philosophy, Vassar College 
Cloth, r2mo, 333 pages, $1.60 net 
“As the author points out, the title of this book might more appro- 
priately have been ‘The Animal Mind Deduced from Experimental 
Evidence,’ for the facts here set forth are very largely the results of 
the experimental method in comparative psychology. The mass of 
experimental material that has been accumulated from the researches 
of physiologists and psychologists is already great, but is also for the 
most part inaccessible to the ordinary student, being widely scattered 
and to a considerable extent published in the journals of specialists, 
which the average college library does not contain. Hence the use- 
fulness of the present . . . interesting work.” — New York Sun. 
The Series is Published by 
THE MACMILLAN COMPANY 
64-66 Fifth Avenue, New York 
