ANIMAL REPRODUCTIONS. 233 
done in my experiments on the reproductions of 
other animals ; and this was an anatomical exa- 
mination of every half head, immediately on fepa- 
ration. I put the decapitated {nails into fo many 
{mall veffels, each numbered the fame as in my 
journal, along with a brief anatomical defcription 
of the parts of each divided head. ‘Thus there 
was no danger of miftake in my experiments 4 
and I could alfo learn whether the parts repaired 
correfponded perfectly in figure and fize to the 
parts cut off. After thefe remarks, which it is 
proper to make, we may pafs to the narrative of 
the refults. 
Immediately after amputation, the fnail retires 
with the greateft precipitation, to conceal itfelf in 
the fhell; and frequently, in the ad of retiring, 
emits a gentle hifling, which arifes'from the dif- 
ficulty which the air finds in efcaping from the 
refpiratory canal, that being in fome meafure 
contracted by the fudden contraction of the body. 
Notwithftanding this enormous wound, the {nail 
fometimes foon afterwards comes out, and begins 
to crawl about in the fame manner as when un- 
-touched. A fnail having loft half the head, and 
then proceeding from the fhell, is defigned, Fig. 
+. The two points rs mark the fituation of 
the {mall horns. ‘The large are lefs than ufual, 
becaufe not fully extended. But the reverfe ge- 
erally happens. However, there is. a very ealy 
method 
