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. KELLOGG, M.S., 

 Professor of Entomology, Leland Stanford Jr. 

 University; and HAROLD HEATH, Professor 

 of Zoology, Leland Stanford Jr. University. 

 Cloth, $1.25 net. 



ANIMAL LIFE. A First Book of Zoology. 

 By DAVID STARR JORDAN and VERNON L. 

 KELLOGG. Cloth, $1.20 net. 



ANIMAL FORMS. An Elementary Text-Book 

 of Zoology. By DAVID STARR JORDAN and 

 HAROLD HEATH. 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 

 GEORGE C. PRICE, Associate Professor of Zo- 

 ology, Leland Stanford Jr. University. Limp 

 cloth, 50 cents net. 



D. APPLETON AND COMPANY, NEW YORK. 



