ANIMAL REPRODUCTIONS. 225 
wendered me defirous to examine whether the 
_ Yame would happen to {nails as to worms ; and 
‘my experiments began with cutting off the horns, 
which, every one knows, are an appurtenance of 
the head. 
That the fection of the horns may be com- 
plete, it is material they fhould be fully pro- 
truded from the head, which enfues when the 
fail ftretches confiderably from its fhell; the 
whole four then being extended, they may be 
cut out by the root. If two are divided,—the 
larger for inftance, the fmaller are inftantly re- 
tracted within the head, and the {nail partly with- 
draws into its fhell; but, in general, it foon ap- 
pears, difplaying the fmaller horns. Hence, the 
experimentalift may cut off all four one by one, 
if he chufes. Though the animal is fo mutilated, 
the head and neck are frequently protruded from 
the fhell the fame as when untouched. | 
A drop, and fometimes a little ftream of trant- 
parent fluid, tending on cerulean colour, pro- 
ceeds from the part where the f{ciffars divide the 
horns: this arifes from the rupture of the glan- 
dular fubitances. In examining the head, now 
deprived of horns, we diicover four pointed 
trunks ; the points being occafioned by corruga- 
tion and contraction of the root of the horn, 
where it has been cut. If we turn to the fepar- 
ated horns, which adhere to the fciflars, we obferve 
Vou. Il. | P that, 
