LITERATURE CITED 28 1 



43. Ellis, Havelock. 1929. The Dance of Life, Boston: 



Houghton Mifflin. 342 pp. 



44. Espinas, A. V. 1878. Des societes animales, Paris: 



Bailliere. 582 pp. 



45. Falk, Isadore. 1927. "Does infant welfare operate to 



preserve the unfit?" Amer. J. Pub. Health 17:142- 



47- 



46. Fischel, W. 1927. "Beitrage zur Soziologie des 



Haushuhns," BioL Zentralhl. 47:678-96. 



47. Folks, Homer. 1920. The Human Costs of the War, 



New York: Harper. 326 pp. 



48. Forbes, S. A. 1887. "The lake as a microcosm," Bull. 



Peoria Acad. Sci. Reprinted in ///. State Nat. Hist. 

 Survey Bull. 15:537-50. 



49. Forbush, E. H. 1925-1929. Birds of Massachusetts 



and Other New England States, Mass. Dept. Agric. 

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50. Fowler, J. R. 1931. "The relation of numbers of ani- 



mals to survival in toxic concentrates of electro- 

 lytes," Physiol. Zool. 4:214-45. 



51. Garner, M. R. 1934. "The relation of numbers of 



Paramecium caudatum to their ability to with- 

 stand high temperatures," Physiol. Zool. 7:408-34. 



52. Gates, Mary, and Allee, W. C. 1933. "Conditioned 



behavior of isolated and grouped cockroaches on 

 a simple maze," /. Comp. Psych. 15:331-58. 



53. Gause, G. F. 1934. The Struggle for Existence, Balti- 



more: Williams and Wilkins. 163 pp. 



54. Gould, H. N. 1917a. Studies on sex in the hermaph- 



rodite mollusc Crepidula plana. I. "History of the 

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 fluence of environment on sex," Ibid. 23:225-50. 

 1919. III. "Transference of the male-producing 

 stimulus through sea-water/' Ibid. 29:113-20. 



55. Grave, B. H., and Downing, R. C. 1928. "The 



longevity and swimming ability of spermatozoa," 

 /. Exp. Zool. 51:383-88. 



