ANIMAL REPRODUDCTIONS. 237 
and the bluntnefs of the fciffars prevents the 
head from being at once divided. | 
I half decapitated three hundred and twenty 
two {nails at different times: the heads of one 
hundred and twenty fix were completely repair- 
ed. ‘Thirty one had different degrees of mon- 
ftrofity or deformity. Fourteen had no repro- 
duction, and the remainder perifhed (1). Thus 
I have learned, that cutting off only half of the 
head was fatal to moft fnails. All thofe that re- 
paired the wanting portion, made the fame ufe 
of it as of the old, as well in the numerous and 
fingular motions peculiar to this part, as in tak- 
ing the fuftaining aliment, fuch as bread, lettuce, 
and the like ; by which means, from being very 
much emaciated before reproducing the head, 
they acquired their original flefhy fullneis. 
ARTICLE IV.—-REPRODUCTION OF THE HEAD. | 
In the former fection, we have feen that the 
complete head of the {nail extended about a line 
beyond the large horns. In this new courfe of 
experiments, I determined to feparate the head 
entiré, and endeavoured to make the cut exaétly 
liz 
(1) I difcovered that half, as well as the whole head, 
would be reproduced during fpring and fummer 1766. 
