ded fpace, to the very edge of the glafs, {fo that a cir- 
cular piece feemed almoft as accurately taken out, as 
if marked by a pair of compaffes. 
Erom the experiments of SPALLANZANI and others, 
it appears that Snails are poffeffed of a very confide- 
rable degree of reproductive power. SPALLANZANI in 
particular, has found that the whole head of a Snail 
may be cut off, and yet in a certain {pace of time will 
be reproduced. ‘This has been denied by fome, but its 
truth is eftablifhed by experiments conducted by the 
moft careful and accurate obfervers. 
It is neceffary to add, that the Snails in the annex- 
ed plate, are reprefented at fomewhat too great a dií- 
tance from each other; this is a circumftance which 
admits of great variation, but in general the animals 
make a nearer approach before they dart their fpicula ; 
and in fome particular inftances they have been known 
to approach fo near during this action, that the dart 
has been infixed in the manner of a fword, in which 
cafe the animal that difcharged it, withdraws again to 
fome little diftance, and feems to wait for a fimilar at- 
tack. 
