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42 figs. 

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Parker, W. K. On Mammalian Descent, London, 1885, 



pp. 229. 

 Pearl, Raymond, Brooding. Journ, of Psychology, 1914, IV, 



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 Fertility and Fecundity. Proc. National Academy of 



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High Productivity in Hens and Preponderance of Female 



Offspring. Science, 1917, XLVI, p. 220. 



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pp. 416-436, 3 figs. 

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334- 

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