F. A. E. Crew 167 



case in which the ovarian tissue was thoroughly healthy in one gonad 

 whilst degenerate in the other. If the presence of the spermatic tissue 

 in one gonad is responsible for the ovarian degeneration, then the agent 

 which produces this must be blood-borne, after the manner of a 

 hormone. 



The Accessory Sexual Apparatus. 



Vasa efferentia. It is seen that every gonad described as a testis, 

 whether it was normal or abnormal, was equipped with these efferent 

 ducts. The testis-portion of every ovo-testis also was linked up with 

 its kidney, but in these cases the vasa efferentia were commonly reduced 

 in number, when compared with the same structures of the typical 

 male. In those cases in which one gonad was an ovary, the findings of 

 different investigators have differed, but in some cases efferent ducts 

 were found cotinecting up gonad and kidney. Similarly, in the case of 

 an ovo-testis, vasa efferentia were found, not only in connection with the 

 testis but with the ovary-portion of the gonad too. Spermatic tissue 

 in a gonad, therefore, is invariably equipped with vasa efferentia, even 

 though its amount is relatively small, and ovarian tissue of an ovo-testis 

 and of an ovary is frequently found to be supplied with these efferent 

 ducts. The less the relative amount of spermatic and the greater the 

 amount of ovarian tissue in the gonads, the less likelihood there is that 

 vasa efferentia of the male pattern will be found. 



It is very exceptional to find any suggestion of efferent ducts in a 

 typical female. During the examination of many hundreds of individuals, 

 no trace of such has been found. Therefore, it is reasonable to assume 

 that whilst the gonads have the constitution represented by the 

 formula Ov. 1, no efferent ducts will be present, and that they make 

 their appearance at the time of the early growth of the testis-portion 

 of the ovo-testis (Sp. 1, Ov. 1), and thereafter keep pace with the 

 development of the testis. 



The seminal vesicles. These were absent in 5 cases (I, 2, 5, 7, and 

 8), and less developed than in the typical male in 10 others (3, 4, 6, 9, 

 11, 12, 16, 18, 23, and 25). Most of these occur towards the beginning 

 of the table, so that the nearer the individual approximates with 

 respect to the nature of the gonads, and to the nature of the secondary 

 sexual characters, to these characters in the typical female, the more 

 likely are the seminal vesicles to be either smaller than those of the 

 typical male or even absent altogether. Conversely, as has been pointed 

 out previously, in those cases in which the gonads and the secondary 



