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(1) ROMANES : Mental Evolution in Animals ; New York, 



1898. 



(2) BURTON : First Footsteps in East Africa ; London, 



1856. 



(3) LUBBOCK : Origin of Civilisation ; New York, 1898. 



(4) DEMOOR : Evolution by Atrophy ; New York, 1899. 



(5) DARWIN : Expression of Emotions in Men and Animals ; 



New York, 1899. 



(6) STARR : Human Progress ; Meadville, Pennsylvania, 



1895- 



(7) HARTMANN : Anthropoid Apes ; New York, 1901. 



(8) BREHM : From North Pole to Equator ; London, 1896. 



(9) STANLEY: In Darkest Africa, vol i. ; New York, 1890. 

 (10) ROMANES : Animal Intelligence ; New York, 1899. 

 (n) EVANS: Evolutional Ethics and Animal Psychology; 



New York, 1898. 



(12) JESSE : Gleanings in Natural History, vol. i. ; London, 



1832. 



(13) PECKHAM AND PECKHAM : Instincts and Habits of the 



Solitary Wasps ; Madison, Wisconsin, 1898. 



(14) CORNISH: Animals of To-day ; London, 1898. 



(15) DARWIN: Descent of Man ; London, 1874. 



(16) HUXLEY : On the Origin of Species, lecture iii. 



(17) THOMPSON : Wild Animals I have Known ; New York, 



1900. 



(18) BREHM: Thierleben ; Leipzig, 1880. 



(19) GILBRAITH: Ethnological Journal, 1869, p. 304. 



(20) KROPOTKIN : Mutual Aid a Factor of Evolution ; New 



York, 1902. 



(21) MORGAN : Animal Behaviour ; London, 1900. 



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