120 ANIMAL ECOLOGY 



Gebirgsbachen. Verhand. naturhis. Ver. der preuss. 

 Rheinlande, Westfalens und des Regiersungsbezirks 

 Osnabriick, Jahrg. 61, pp. 103-178. 

 Shows the relation of behavior to the local distribu- 

 tions of Planarians. 

 WAGNER, W. 



1907. Psycho-biologische Untersuchungen an Hummeln mit 



Bezugnahme auf die Frage der Geselligkeit im Tier- 

 reich. Zoologica (Chun), Bd. XIX, Heft 46, pp. 

 1-239. 



An important study of the behavior of Bombus. 

 WALTER, H. E. 



1906. The Behavior of the Pond Snail, Lymnceus Eleodes 



Say. Cold Spring Harbor Monogr. VI. pp. 35. 

 WASMANN, E. (Trans.) 



1903. Instinct and Intelligence in the Animal Kingdom. A 

 Critical Contribution to Modern Animal Psychology, 

 pp. 171. St. Louis, Mo. From the second and 

 enlarged German edition. 



1905. Comparative Studies in the Psychology of Ants and of 

 Higher Animals, pp. 200. St. Louis, Mo. Trans- 

 lated from the revised and enlarged second German 

 edition. 

 WATSON, J. B. 



1908. The Behavior of Noddy and Sooty Terns. Pub. 103, 



Carnegie Inst. pp. 187-255. 



An excellent account of bird behavior in colonial species. 

 WHEELER, W. M. 



1903. Ethological Observations on an American Ant (Lepto- 

 thorax Emersoni Wheeler). Jour, fiir Psychol. und 

 Neurol., Bd. II, pp. (1-31). 

 1910. Ants, their Structure, Development and Behavior, pp. 



663. New York. 



The most useful single work on ants, ant behavior, 

 slaves, commensals, etc. ; a very important work. 

 Extensive references. 



