TWENTIETH CENTURY TEXT-BOOKS. 
ZOOLOGY. 
ANIMAL STUDIES. A one-book course in 
Zoology for secondary schools. By DaviD 
STARR JORDAN, President of Leland Stanford 
Jr. University; VERNON L. KELLocG, M.S., 
Professor of Entomology, Leland Stanford Jr. 
University; and HaroLrpD HEATH, Professor 
of Zoology, Leland Stanford Jr. University. 
Cloth, $1.25 net. 
ANIMAL LIFE. A First Book of Zoology. 
By Davip STARR JORDAN and Vernon L. 
KeEttocc. Cloth, $1.20 net. 
ANIMAL FORMS. An Elementary Text-Book 
of Zoology. By Davip STarR JORDAN and 
Haro_p HeEatu. Cloth, $1.10 net. 
ANIMALS. A Text-Book of Zoology. By 
JoRDAN, KELLOGG, and HeaTH. (The two 
foregoing in one volume.) Cloth, $1.80 net. 
TEACHER'S MANUALS. 
ANIMAL STRUCTURES. A_ Laboratory 
Manual of Zoology. By D. S. JoRDAN and 
GrorGE C. Prick, Associate Professor of Zo- 
ology, Leland Stanford Jr. University. Limp 
cloth, 50 cents net. 
‘D. APPLETON AND COMPANY, NEW YORK, 
