558 



Dr. F. H. A. Marshall and Mr. E. T. Hainan. 



from the Board of Agriculture and Fisheries out of funds placed at their 

 disposal by the Development Commissioners. 



[Added June 6, 1917. — Leo Loeb states that there is a definite cycle in the 

 non-pregnant Guinea-pig for the mammary gland, and that it corresponds 

 with the ovarian and uterine cycles. The gland tissue proliferates when a 

 new ovulation is imminent or in the presence of corpora lutea. Extirpation 

 of the corpora lutea was followed by an inhibitory effect. 



Pearl has suggested that the corpus luteum is one of the chief agents in 

 maintaining the female secondary characters, since a cow began to assume 

 the characters of the male upon ceasing to ovulate, although the germinal 

 and interstitial tissue of the ovaries remained normal. He states also that 

 the corpus luteum has an inhibitory effect upon ovulation, this conclusion 

 being based partly upon the effects of injecting luteal extract into fowls.] 



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Ancel and Bourn, " Sur les Fonctions du Corps Jaune Gestatif," 1 Journ. Physiol, et Path. 



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la Soc. de Biol.,' vol. 79 (1916). 

 Beard, ' The Span of Gestation and the Cause of Birth,' Jena, 1897. 

 Bell, Blair, ' The Sex Complex,' London, 1916. 



Bryce and Teacher, 'Contributions to the Study of the Early Development and 



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' Roy. Soc. Proc.,' B, vol. 79 (1907). 

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this vol., supra. 



Hammond and Hawk, "Studies in Milk Secretion," 'Journ. Agric. Science,' vol. 8 (1917). 

 Hammond and Marshall, "The Functional Correlation between the Ovaries, Uterus, 



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(1905). 



Heape, " The Source of the Stimulus which Causes the Development of the Mammary 

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Keller, "Uber den Bau de3 Endometriums beim Hunde," ' Anat. Hefte,' vol. 118 (1909). 



Loeb, " The Cyclic Changes in the Mammary Gland under Normal and Pathological 



