VOL. LXXXVII.] PHILOSOPHICAL TRANSACTIONS. 131 



all quadrupeds, and in women themselves, whether the embryo is visible or not. 

 The use of the corpora lutea is not yet made out ; but the orifice, through which 

 the ovum bursts into the fallopian tube is often extremely manifest, and always has 

 a ragged border, as lacerated parts usually have. The fallopian tubes, independent 

 of their black colour, were twisted like wreathing worms, the peristaltic motion 

 still remaining very vivid ; the fimbriae were also black, and embraced the ovaria 

 (like fingers laying hold of an object) so closely, and so firmly, as to require some 

 force, and even slight laceration, to disengage them. 



Exper. 2. I opened a female rabbit 1 hours after she received the male : the 

 black bloody spots, just mentioned, now projected much above the surfaces of the 

 ovaria, some of the ruptured orifices were just visible ; but in many of these spots 

 there was not the least vestige of an orifice ; whence I conclude that they heal very 

 quickly in general. While the animal was yet warm, I injected the arterial system 

 with size coloured with vermillion, whence every thing I had seen before became 

 now more distinct, and the black spots, which I before conjectured to be congeries 

 of vessels, were now proved to be so. 



Exper. 3. I opened another female rabbit the 3d day after impregnation : that 

 she was impregnated I could have no doubt, for I never knew impregnation fail if 

 the female was hot, and the male had not been previously exhausted ; besides the 

 corpora lutea in the ovaria fully proved it : the appearances were the same as in the 

 last, only the corpora lutea were larger ; but though I examined the fallopian tubes 

 in the sunshine, and with great care, I could not find any ova, neither in them nor 

 in the horns of the uterus. 



Exper. 4. I opened another female rabbit the 5th day after conception : the ap- 

 pearances were much the same as in the former animal, only the corpora lutea 

 were increased in bulk, but there was not the least vestige of any ovum any where 

 that I could discover. I was now ready to exclaim with Haller, " vix liceat ad- 

 mittere." 



Exper. 5. I opened another female rabbit on the 8th day after she had admitted 

 the male : the ova were in the cavity of the uterus, and projected through its sub- 

 stance about the size of a large garden pea ; when I cut off the most superior part, 

 and cut into the cavities of the ova, the liquor amnii escaped in a proportionate 

 quantity : by their adhesions to the internal surface of the uterus they remained 

 extended, not collapsing in the smallest degree ; the foetus was not visible ; but I 

 had often made the chick, in my experiments on the incubated egg, become visible, 

 by dropping on the spot, where I knew it must be, a drop of distilled vinegar ; by 

 dropping the vinegar on the bottom of the little cups I had made, by cutting off 

 the tops of the cells, the foetus instantly became visible. 



Exper. 6. Opened another, 9th day : foetus contained within its amnion, floats 

 in another fluid, between chorion and amnion, which are now at a considerable 

 distance; this fluid jellies in proof spirit. Some corpora lutea have cavities, others 



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