AMERICAN NATURE SERIES _ (Continued) 
I. NATURAL HISTORY (Continued) 
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 
1. Library Series, very full descriptions, 8vo. 74x10 in. 
Already publisht: 
NORTH AMERICAN TREES, by N. L. Brirron, Director of the 
New York Botanical Garden. $7.00 net; carriage extra. 
FERNS, by Campsectt E, Waters, of Johns Hopkins University, 
$3.00 net; by mail, $3.30. 
2. Pocket Series, Identification Books—‘‘ How to Know,’’ brief and 
in portable shape. 
Ill. FUNCTIONS OF NATURE 
These books will treat of the relation of facts to causes and 
effects—of heredity and the relations of organism to environment. 
8vo. 6§x8% in. 
Already publisht: 
THE BIRD: ITS FORM AND FUNCTION, by C. W. Berns, 
Curator of Birds in the New York Zoological Park. $3.50 net; 
by mail, $3.80. 
Arranged for: 
THE INSECT: ITS FORM AND FUNCTION, by Vernon L. 
Kettoce, Professor in the Leland Stanford Junior University. 
THE FISH: ITS FORM AND FUNCTION, by H. M. Smurru, of 
the U. S. Bureau of Fisheries. 
IV. WORKING WITH NATURE 
How to propagate, develop, care for and depict the plants and 
animals. The volumes in this group cover such a range of subjects 
that it is impracticable to make them of uniform size. 
Already publisht: 
NATURE AND HEALTH, by Enpwarp Curtis, Professor Emeritus 
in the College of Physicians and Surgeons. 12mo. $1.25 net; 
by mail, $1.37. 
THE FRESHWATER AQUARIUM AND ITS INHABITANTS. 
A Guide for the Amateur Aquarist, by Orro Eeortine and 
Freperick Exrengerc. Large 12mo. $2.00 net; by mail, $2.19. 
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