398 ANIMAL AGGREGATIONS 



Robertson, T. B. 1924a. The influence of washing upon the multiplication 

 of isolated Infusoria and upon the allelocatalytic effect in cultures initially 

 containing two Infusoria. Ibid. 1:151-75. 



. 1924^. Allelocatalytic effect in cultures of Colpidiiim in hay infusion 



and in synthetic media. Biochem. Jour. 18:1240-47. 



. 1925. The influence of cholesterol and oxycholesterol upon the multi- 



plication of Infusoria {Enchelys). Australian Jour. Exp. Biol, and Med. 

 Set. 2:83-90. 

 . 1927. On some conditions affecting the viability of Infusoria and the 



occurrence of allelocatalysis therein. Ibid. 4:1-24. 



RossMAN, Bruno. 1928. Untersuchungen uber die Theorie der mitogene- 

 tischen Strahlung. Arch. f. Eutw. d. Organ. 113:346-406. 



RouBAUD, E. 1923. Les desharmonies de la fonction renale et leurs conse- 

 quences biologiques chez les moustiques. Ann. d. rinstitut Pasteur. 37:627- 

 79- 



RouBAUD, E., and J. Colas-Belcour. 1927. Action des diastases dans le de- 

 terminisme d'eclosion de I'oeuf chez le moustique de la fievre jaune {Stegomyia 

 fasciata). Comp. Rend. Acad. Sci. Paris. 184:248-49. 



Rous, P., and F. S. Jones. 1916. A method for obtaining suspensions of living 

 cells from the fixed tissues, and for plating out individual cells. Jour. Exp. 

 Med. 23:549-55. 



Roux, W. 1894. tJber den Cytotropismus der Furchungszellen des Gras- 

 frosches. Arch. f. Entw. d. Organ. 1:161-202. 



Rowan, William. 1922. Ecological note on the birds observed at the biologi- 

 cal station of the University of Manitoba. Ecology 3:43-69, 255-60. 



Russell, E. John. 1927. Soil Conditions and Plant Growth. London: Long- 

 mans, Green. 516 pp. 



Ruthven, a. G. 1908. Variations and genetic restrictions in garter snakes. 

 U.S. Nat. Mus. Bull. 61. 201 pp. 



RuTTER, Cloudsley. 1903. Natural history of the Quinnat salmon. Bull. U.S. 

 Fish Comni. 22:65-141. 



Salkind, S., a. Potozky, and I. Zoglina. 1930. Die mitogenetische Beein- 

 flussimg der Eier von Protodrilus und Saccocirrus. Arch. f. Entw. d. Org. 

 121:630-34. 



Sampson, M. 1922. Iso-agglutination and hetero-agglutination of spermatozoa. 

 Biol. Bull. 43:267-83. 



Sargent, P. Florence. 1926. Overpopulation, Theory and Statistics. London: 

 Kegan Paul. 66 pp. 



Sarles, M. p. 1929. The effect of age and size of infestation on the egg pro- 

 duction of the dog hookworm, Aneylostoma caninum. Amer. Jour. Hygiene 

 10:658-82. 



Saunders, A. A. 1914. An ecological bird study, ^w^ 30:200-210. 



Savage, T. S. 1847. Notice of external characteristics and habits of Troglo- 

 dytes gorilla. Boston Jour. Nat. Hist. 5:417-43. 



