LAWS OF INTERNAL CHANGE 115 



tion of Fresh-water Mussels. U. S. Bur. Fisheries 

 for 1910, Bull. Vol. XXX, pp. 105-201. 

 LYON, E. P. 



1904. On Rheotropism. I. Rheotropism in Fishes. Amer. 



Jour. Physiol., Vol. XII, pp. 149-161. 

 MAST, S. O. 



1911. Light and the Behavior of Organisms, pp.410. New 



York. 



An elaborate treatise on reactions to light. 

 MEAD, A. D. 



1900. The Natural History of the Star-fish. U. S. Fish 



Comm. Bull, for 1899, Vol. XIX, pp. 203-224. 

 MICHAEL, E. 



1911. Classification and Vertical Distribution of the Chsetog- 

 natha of the San Diego Region. Univ. of Calif. 

 Pub. Zool., Vol. VIII, pp. 21-186. 

 The distribution is studied as a response to the condi- 

 tions of life, and the optima are determined. 

 MILLS, W. 



1898. The Nature and Development of Animal Intelligence. 



pp. 307. New York. 



Valuable account of the habits of squirrels. Obser- 

 vations on hibernation, and on the psychic develop- 

 ment of the young of some of the domestic animals. 

 MONTGOMERY, T. H. 



1903. Studies on the Habits of Spiders, particularly those of 

 the Mating Period. Proc. Acad. Nat. Sci. Phila., 

 1903, pp. 59-149. 

 Contains a valuable bibliography. 

 1908. Further Studies on the Activities of Araneads. Amer. 



Nat., Vol. XLH, pp. 697-709. 

 1910. Further Studies on the Activities of Araneads, II. 



Proc. Acad. Nat. Sci. Phila., 1909, pp. 548-569. 

 1910. The Significance of the Courtship and Secondary Sexual 

 Characters of Araneads. Amer. Nat., Vol. XLIV, 

 pp. 151-177. 



