BULLETIN 237. 



SEX STUDIES. VII. ON THE ASSUMPTION OF MALE 



SECONDARY CHARACTERS BY A COW 



WITH CYSTIC DEGENERATION 



OF THE OVARIES.' 



Raymond Pearl and Frank ]\I. Surface. 



Evi'dence regarding the relation between somatic secondary 

 sexual characters and the primary sex organs, the gonads, is 

 derived in the main from one or another of three sources, viz, : 



1. Castratiioo expeirimients. 



2. Transiplantation, or organ extract injection experiments. 



^Papers from the Biolagical Laboratory of the Maine Agricultural 

 Experimen't Station, No. 82. 



This paper forms the seventh in a series of studies on various phases 

 of the problems of sex determination and secondary sexual characters 

 which have been published by the senior author and his associates during 

 the past seven years. In accordance with a general policy of the labora- 

 tory it is proposed that, in the future, papers dealing with these problems 

 shall appear under the general title "Sex Studies." The papers which 

 have already appeared in this series, and which are now assigned numbers 

 in the order of their appearance, in accordance with the above mentioned 

 policy, are : 



Sex Studies I. On the Relation of Race Crossing to the Sex Ratio. By 

 Maud Dewitt Pearl and R. Pearl. Biol. Bui., Vol. XV, pp. 194-205, 1908. 



11. A Case of Hypospadias in a Ram. By R. Pearl. American Vet. 

 Rev., Vol. XL, No. 6, pp. 794-796, 1912. 



IIL The Interstitial Cells and Supposed Internal Secretion of the 

 Chicken Testis. By A. M. Boring, Biol. Bui., Vol. XXIII, pp. 141-153, 

 1912. 



IV. Fat Deposition in the Testis of the Domestic Fowl. By R. Pearl 

 and A. M. Boring, Science, N. S., Vol. XXXVI, pp. 833-835, 1912. 



V. Data on Sex Determination in Cattle. B}^ R. Pearl and H. M. 

 Parshley. Biol. Bui., Vol. XXIV, pp. 205-225, 1913. 



VI. The Relative Time of Fertilization of the Ovum and the Sex 

 Ratio Amongst Jews. By R. Pearl and Redcliffe N. Salaman. Amer. 

 Anthropol., Vol. XV (N. S.), pp. 668-674, I9i4- 



