ANIMAL REPRODUCTIONS. 243 
After obtaining reproduction of the head, it 
was very natural to think that fnails would re- 
generate other parts lefs effential; fuch as, the 
eminent collar which furrounds and ornaments 
the back of the animal; when out of the fhell, 
and the flat broad foot by which it is fupported 
luring its motion: Thefe two parts, when cut 
off, were repaired in the beft poflible manner 5 
nature reproducing much or little, according as 
it had been cut away. 
Uniting, in one point of view, what we have 
hitherto faid of the reproductions of fnails, it 
clearly appears; 1. That they can repair the 
horns, whether partially or wholly amputated ; 
2. The head, when half is cut off ; 3. That it is as 
completely reproduced; though the whole has been 
fevered ; 4. Whatever part of the collar or foot 
is cut off, it is regenerated: From which it is 
evident, that thefe reptiles recover precifely the 
parts that they have loft: This is not peculiar to 
them, for it takes place in other reproducing ani- 
mals. Ifa newt wants a third or fourth of the 
tail, only a third or a fourth is reproduced ; and 
the fame may be faid of one half, or the whole 
tail. A fimilar phenomenon fucceeds in the fore 
and hind legs of this amphibious animal (1). 
-Reprodu@ion of the parts wanting only, extends 
invariably to worms, as alfo to frogs, while yet 
Q2 tadpoles, 
(1) Prodromo citats 
