Anatomy and Physiology, 69 



tion to be able to distinguish the males from the females. 

 In both there is a sinus urogenitalis, and a part which may 

 pass for the bottom of the vagina and the body of the uterus. 

 Into this organ enter in the females the horns of the uterus ; 

 in the males the deferent canals, extremely like the horns 

 of the uterus, with this only difference, that the horns open 

 into its upper part, while the deferent canals open into its 

 lower. The organ corresponding to the rudiment of the 

 vagina, to the body, and to the horns of the uterus, is also found 

 in the adult rabbit : it is a sac provided with muscular fibres 

 which receives the semen, and is so irritable, that in an animal 

 recently killed it contracts under the influence of mechanical 

 or galvanic stimuli. 



4. In the male adult beaver and in the pig, the rudimentary 

 uterus is, as in the females of these animals, a two-horned 

 uterus, situated in the same place between the rectum and the 

 bladder, and like it in a fold of peritoneum. 



5. In the dog, the orifice of the uterus appears to be obli- 

 terated, so that its cavity has no opening ; it is the same with 

 the cat. In the horse and in man this orifice is also at times 

 obliterated ; but this is exceptional : commonly the male 

 uterus of the stallion opens into the urethra at the colliculus 

 seminalis by a single orifice. This organ is seldom short 

 in the horse. It is sometimes nine inches long, and has two 

 horns at its extremity. In fine, in the beaver and the rabbit, 

 the orifice of the male uterus is never obliterated, and in 

 the latter the different canals pour out the seminal fluid into 

 its cavity a little below this orifice. 



6. According to the observations of Rathke on the sheep 

 and the pig, the uterus of the male embryos, is at a certain 

 stage so exactly like that of the female, that there is extreme 

 difficulty in distinguishing them, (this accords with the pub- 

 lished observations of MM. Serres and St. Hilaire.) 



7. From the description by Ackermann of the genital 

 organs of a human hermaphrodite, in whom the male form 



