4 
224. ANIMAL REPRODUCTIONS, 
ARTICLE Il.—-REPRODUCTION OF THE HORNS, 
OR ANTENNE. 
Wuen I firft difcovered that {nails regenerated 
the horns and fevered head, feveral philofophers 
enquired what motives or reafons induced me to 
fuppofe thefe parts could be reproduced: and it 
is not improbable that the fame queftion may oc- 
cur to fome of my learned readers, to whom I 
fhall briefly anfwer, as I have hitherto done. 
Previous to engaging with the reproductions of — 
{nails, I was employed with thofe of earth worms, 
concerning which there is a chapter in my Pro- 
dromo fopra le Reproduzioni Animali, and often 
had occafion to obferve how much the reproduc- 
tion was promoted, when protected from the in- 
juries of the open air, by remaining covered in 
moift earth or dung. This very fimple remark 
recalled to my memory the ftate of {nails muti- 
lated in certain parts of the body, I had feen 
them fhut themfelves up within their portable 
dwellings, clofing the mouth with that yifcous 
fubftance which exudes from the body, fo that 
the air could with the greateft difficulty get ac- 
cefs. I then reflected, that a mutilated fnail, re- 
ted within its fhell, and fhut up with the cover- 
ing, was in a fimilar fituation to decapitated 
earth warms depofited in moiftened earth. This 
rendered 
