vi ANIMAL LIFE 
best use on a basis of personal observational work by the 
student in laboratory and field. Without independent 
personal work of the student little can be learned about 
animals and their life that will remain fixed. But present- 
day teachers of biology are too well informed to make a 
discussion of the methods of their work necessary here. 
As a matter of fact, the methods of the teacher depend so 
absolutely on his training and individual initiative tat it 
is not worth while for the authors to point out the place 
of this book in elementary zodlogical teaching. That the 
phase of study it attempts to represent should have a place 
in such teaching is, of course, their firm belief. 
The obligations of the authors for the use of certain 
illustrations are acknowledged in proper place. Where no 
credit is otherwise given, the drawings have been made by 
Miss Mary H. Wellman or by Mr. James Carter Beard, and 
the photographs have been made by the authors or under 
their direction. 
Davip STARR JORDAN, 
VERNON Lyman KELLOGG. 
Notr.—After the pages of the book were cast, it was thought that 
a transposition of Chapters III and IV would present a more logical 
arrangement, and Leachers are advised to omit in their study scheme 
Chapter ILI until Chapter 1V is completed. D. 5. J. 
V. LK. 
