AMERICAN NATURE SERIES _ (Continued) 
with Chapter on Anatomy of Birds by Freperic A. Lucas, 
Chief Curator Brooklyn Museum of Arts and Sciences, and edited 
by Roserr Ripeway, Curator of Birds, U.S. National Museum. 
REPTILES AND BATRACHIANS, by Leonnarp SresNeceER, Cura- 
tor of Reptiles, U. S. National Museum. 
Section B. A Shorter Natural History, mainly by the Authors 
of Section A, preserving its popular character, its proportional treat- 
ment, and its authority so far asthat can be preserved without its 
fullness. Size not yet determined. 
II. CLASSIFICATION OF NATURE 
Section A. Realms of Nature. Detailed treatment of various 
departments in a literary and popular way. 8vo. 74x10} in. 
Already publisht : 
FERNS, by Campsett E, Warens, of Johns Hopkins University. 
8vo, pp. xi+-362. $3.00 net; by mail, $3.30. 
Section B. Identification Books— 
1. Library Series, very full descriptions, 8vo. 7$x10$ in. 
Already publisht : 
NORTH AMERICAN TREES, by N. L. Brirroy, Director of the 
New York Botanical Garden. $7.00 net; carriage extra. 
2. Pocket Series, ‘‘ How to Know,”’ brief and in portable shape. 
II. FUNCTIONS OF NATURE 
These books will treat of the relation of facts to causes and 
effects—of heredity in organic Nature, and of the environment in 
all Nature. 8vo. 62x8¢ in. 
Already publisht : 
THE BIRD: ITS FORM AND FUNCTION, by C. W. Beene, 
Curator of Birds in the New York Zoological Park. 8vo, 496 pp. 
$3.50 net; by mail, $3.80. 
Arranged for : 
THE INSECT: ITS FORM AND FUNCTION, by Vernon L. 
Kettoee, Professor in the Leland Stanford Junior University. 
THE FISH: ITS FORM AND FUNCTION, by H. M. Suarru, of 
the U. S. Bureau of Fisheries. 
