NEW BIOLOGICAL BOOKS 



585 



concrete, and on Limnoria and its allies. 

 There are numerous excellent illustrations. 



AN ECOLOGICAL STUDY OF SOUTH- 

 ERN WISCONSIN FISHES. The Brook 



Silver sides (Labidesthes sicculus) and the Cisco 

 (Leucichthys artedf) in Their Relations to the 

 ■Region. 



By Alvin R. Cahn. University of Illinois Press 

 $1.50 7 x io|; 151 (paper) Urbana 

 The author has studied in considerable 

 detail the habits of the brook silversides 

 and the cisco. His results, particularly 

 with reference to the daily migrations of 

 the silversides, are interesting and impor- 

 tant. He finds that in addition to be- 

 ing positively phototropic, the fish are 

 markedly sensitive to change in pH, and 

 that the daily migration can be accounted 

 for as an attempt to maintain a pH equi- 

 librium of approximately 7.7. 



view. Outline figures of common species 

 are given as an aid to identification. The 

 ecologist will find this a handy little book 

 to have about, though it is intended for 

 the amateur. 



DIE TIERWELT DER NORD- UND 



OSTSEE. Lieferung XL 



Edited by G. Grimpe and E. Wagler. 



Akademische Verlagsgesellschaft 

 1 1 . 2_o marks Leipzig 



6 x 8|; 1x4 (paper) 

 Previous parts of this valuable work 

 have been noticed from time to time in 

 these pages. The present section covers 

 the following groups : Pterobranchia, by C. 

 J. van der Horst; Chaetognatha, by W. 

 Kuhl; Kinorhyncha, by A. Remane; Pan- 

 topoda (supplemental article), by J. 

 Meisenheimer; Tardigrada, by O. Rahm; 

 Anoplura Pinnipediorum, by L. Freund. 



BIRDS OF THE OCEAN. A Handbook 

 for Voyagers. Containing Descriptions of All 

 the Sea-birds of the World, with Notes on their 

 Habits and Guides to their Identification. 

 By W. B. Alexander. G. P. Putnam s Sons 

 $3.50 3! x 6f; xxiii + 4x8 New York 



A well illustrated handbook for the 

 identification of all the seabirds of the 

 world. There are also chapters dealing 

 with the different oceans and the breeding 

 areas of the seabirds found in them. Any 

 voyager or resident at the seaside would 

 find this book useful. 



UNSERE KAFER. 



By Max Wolff. Ullstein 



0.85 marks 4J x 7; 137 (paper) Berlin 



A popular treatise on beetles from a 



rather high-toned nature study point of 



BIOLOGICAL SURVEY OF THE UPPER 

 MISSISSIPPI RIVER WITH SPECIAL 

 REFERENCE TO POLLUTION. From 

 Bulletin of the Bureau of Fisheries, Vol. 

 XLIII, 1927, Part II. Document No. 1028. 

 By A. H. Wiebe. 



U. S. Government Printing Office 

 10 cents Washington 



7 fx 11; 33 (paper) 



PRODUCTION AND DISTRIBUTION 

 OF COD EGGS IN MASSACHUSETTS 

 BAY IN 192.4 AND 19x5 . From Bulletin of 

 the Bureau of Fisheries, Vol. XLIII, 1927, 

 Part II. Document No. 10 }t. 

 By Charles J. Fish. 



U. S. Government Printing Office 



15 cents Washington 



7§ x 11; 46 (paper) 



These two papers will be of particular 



interest to the ecologist. The teacher of 



