eititats aa J Soa. Cc C asset 
a ty | 915 Arch Street, Philadelphia, . 
Manufacturer of 
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FRESH WATER BIOLOGY ~ 
By HENRY B. WARD and GEORGE C. WHIPPLE ~ 
WITH THE COLLABORATION OF 25 DISTINGUISHED SPECIALISTS : 
All interested in aquatic biology will find here answers to their 
queries on methods of study, conditions of existence, types of life, and 
inter-relations of the organisms that inhabit our fresh-water bodies, 
together with data on their life histories, habits and range. : 
This work is. the first complete and accurate record of “Northi Amer- 3 
ican aquatic life, especially the micro-organisms; among both plants 
and animals excluding the vertebrates, “higher plants and bacteria, 
every form is described that has been reported from a fresh- water body 
on this continent. 
A comprehensive general discussion of each group precedes the 
description of individual forms, which are arranged under a key to 
permit of rapid and accurate determination of the genera and species. 
Nearly every form is illustrated, and its diagnostic features are pointed 
out. Biological data on its habits, frequence and distribution are also 
given. 
Fresh-Water Biology is a big book of 1111 pages, with 1544 illus- 
trations. Price, $6.00, plus postage on four pounds. 
AQUATIC LIFE, 542 E. Girard Avenue, Philadelphia, Pa. 
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