concerning Animal Impregnation. 175 
in the former, and notwithstanding many solicitations from a 
very animated male, during the space of three months, it could 
never be excited. 
On dissection, it appeared that the tubes were as completely 
obliterated in this experiment as in the last, and the ovaries 
had equally degenerated. 
In the two preceding experiments neither of the rabbits had 
given any active proofs of fecundity, though they had marks 
of the venereal heat upon them. I therefore changed my sub- 
ject for one that had had young ones. 
EXPERIMENT. 
A healthy rabbit, which had lately been separated from her 
first litter, was made the subject of a repetition of the experi- 
ment. I took the opportunity of feeling for the ovaries, in 
order to have better evidence respecting their bulk, and by that 
means to form a juster comparison. The disposition to pro- 
pagation declined as evidently in this animal as in the two for- 
mer ; and dissection equally evinced a change of the ovaries ; 
for at the expiration of three months, they had lost nearly half 
their size. 
Feeling but little encouragement to persevere in a repetition 
of these experiments, I determined to change the mode of in- 
quiry, and to try the effect of a division of one tube only. 
From reasoning I was led to think, that if a division of both 
tubes destroyed the harmony of the generative system, a divi- 
sion of one only might permit that harmony to continue in 
some degree. I wished likewise, if possible, to have this point 
determined on a virgin rabbit, the better to guard against any 
