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 compafles. 



From 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 fpace of time will 

 be reproduced. This has been denied by fome, but its, 

 truth is eftablifhed by experiments conduced by the 

 moft careful and accurate obfervers. 



It is neccflary to add, that the Snails in the annex- 

 ed plate, are reprefented at fomewhat too great a dis- 

 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 aftion, 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. 



