556 THE MEMBRANES. 



extracted entire. In cloven-footed animals, which conceive 

 within the horns of the uterus, and also in the solidungula, one 

 ovum only of this kind is found, and that stretching up into 

 either horn of the uterus : and although these animals some- 

 times produce one, sometimes two young at a birth, and so 

 sometimes one, sometimes two colliquaments are found, one 

 in the right, the other in the left horn of the uterus, yet the 

 two are always contained in one and the same ovum. 



In other animals, however, the number of ova answers to the 

 number of foetuses, and within them are as many colliqua- 

 ments : this is the case in the dog, cat, mouse, and other 

 animals of this kind with teeth in either jaw. In cloven- 

 footed animals the ovum is shaped like a saddle-bag : the form, 

 in fact, under which Fabricius represented the allantois. In 

 the mare, the figure of the uterus internally resembles an ob- 

 long bag ; in the woman it is of a globular form. 



In animals in whom the " conception" adheres to the uterus, 

 (and in very many it does not do so until the foetus is fully 

 formed), this takes place in various modes. In some it is ad- 

 herent in one place by the intervention of a fleshy substance, 

 which in the woman is called the "placenta," from its resem- 

 blance to a round cake (placenta) : in others it is attached at 

 many points by certain fleshy bodies, or " carunculse :" these 

 are five in number in the hind and doe; more numerous, 

 but of smaller size, in the cow ; and in the sheep they are 

 in great numbers and of various sizes. In dogs and cats these 

 fleshy bodies entirely surround each ovum like a girdle. A 

 similar substance, in the hare and mole, grows to the side of 

 the uterus : like the human placenta, which embraces about 

 half the " conception," (just as the cup does the acorn at the 

 commencement of its growth), it is attached by its convex 

 aspect to the uterus, and by its concave surface to the chorion. 



With these observations premised, I shall now state my 

 opinions on the humours, membranes, fleshy substance of the 

 uterus, and the distribution of the umbilical vessels, in the 

 order described by Fabricius. 



The words Sevrtpa and wrttpa are correctly understood by 

 Fabricius 1 to answer to "secundse" and "secundina" (the 



1 Cap. v. 



