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FRESH WATER BIOLOGY 



By HENRY B. WARD AND GEORGE C. WHIPPLE 



WITH THE COLLA BORATION 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 North Amer- 

 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 1547 illus- 

 trations. Price, $7.50 Postage Paid 



AQUATIC LIFE, 632 E. Girard Avenue, Philadelphia, Pa 



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Live Food is Nature's Food 



Give your fishes white worms, which can 

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 Generous portion, 60 cents, with full instruc- 

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 Jenne.) W. J. WRIGHT 



Bergen Avenue and Mercer Street, 

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Mesogonisteus chaetodon— The 



Black-banded Sunfish. $6 and $12 

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If you mean business, send check with order 



GEORGE W. PRICE 



2145 South Lee Street, Philadelphia 



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Plant Names 



and their meanings are explained and 

 the haunts, habits and other interesting 

 features of the wild flowers are dis- 

 cussed in 



The American Botanist 



Joliet, Illinois 



Quarterly, $1.50 a year; sample, 25 

 cents. Your subscription is invited. 



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The 



Microscopy of Drinking 



Water 



By GEORGE CHANDLER WHIPPLE 



The third edition, rewritten and en- 

 larged, contains 409 pages, with 74 

 figures, 6 full-page plates in the text, 

 and 19 plates giving 235 illustrations 

 of organisms in color. Price, post- 

 paid, $4.50. 



The Book Department :: Aquatic Life 



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OTHER TROPICALS 



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L. W. REHBEIN 



2115 HUNTING PARK AVENUE 

 PHILADELPHIA 



