48 Studies in Animal Behavior 



the progeny, leading on to active solicitude for the 

 young, and thence to social instincts which finally 

 blossom out into the rich endowment of altruistic 

 emotions and sentiments of highly evolved social life. 

 It is in reproduction, which is essentially an altruistic 

 activity, that we must seek for the roots of altruism. 

 Egoism and altruism in their primal manifestations 

 are coeval rather than successive phenomena. The 

 primitive organism which grows and divides by fis- 

 sion shows us the germ of both of these traits. 



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Darwin, C. The descent of man. N. Y., 1874. 



Fabre, J. H. Souvenirs entomologiques, T. 9. 



FiSKE, J. The meaning of infancy. N. Y., 1909. 



Holmes, S. J. Observations on the habits and 

 natural history of Amphithoe longimana. Biol. 

 Bull. 2, 165, 1900. 



Mitchell, P. C. The childhood of animals. 

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Morgan, C. L. Animal behavior. London, 

 1900. 



Peckham, G. W. and E. G. On the instincts 

 and habits of the solitary wasps. Bull. No. 2, Wis. 

 Geol. Nat. Hist. Soc, 1898. 



Pycraft, W. p. Infancy of animals. N. Y., 

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