370 DE D. BEKKY HART. 



lower third is formed by the coalescence of the Wolffian bulbs 

 and nrinogenital sinus. 



4. Between the lowest and highest female mammals there 

 are gradations in the representation of the Wolffian ducts in 

 the genital tract. This still requires determination. It is 

 known that the Wolffian ducts persist to a marked extent in the 

 cow and sow (Gartner's canal), and additional mammals must 

 therefore be examined as to the point. 



5. The colliculus seminalis of the adult human male is the 

 analogue of the hymen and lower third of the vagina. The 

 Miillerian ducts are not represented in the adult human male 

 so far as is known — except by the hydatid of Morgagni and 

 some rudiments near the testis. 



6. Skene's ducts in the female urethra are prostatic analogues, 

 but the nature and analogues of the vesiculte seminales are as 

 yet not accurately determined. 



7. The spermatzoou is a specialised pleuro-peritoneal cell, 

 and its excretion is practically a specialised Wolffian function. 



8. The ovum is a specialised pleuro-peritoneal cell, but its 

 excretion is along a duct formed later than the Wolffian one, 

 and cannot be represented as a specialised Wolffian function, 

 unless we hold that the ]Mullerian duct has a pronephric Anlage. 



9. In the formation of the lumina of the preputium clitoridis, 

 vagina, male urethra (spongy portion and glans), and permanent 

 anus, the epidermis between the 2nd and 4th month of foetal 

 life is the active agent. First a solid plug of epidermis passes 

 in, with its superficial cells central, its more active ones deep ; 

 desquamation of the central cells ensues, and thus the lumen 

 remains lined with cells of an ectodermic origin. 



10. True mucous membrane is hypoblastic in origin. 



