232 ANIMAL REPRODUCTIONS. 
Having obtained reprodu€tion of the horns, 
it occurred to me to examine what would en- 
fue on fevering the head; but apprehenfive that 
the fnails would die before repairing the whole, 
my experiments were begun with truncating a 
‘part only, which was that free of the larger horns, 
and comprehending the lips, the mandible, and 
tooth, the tongue and the two leffer horns, be- 
fides the mufcular involucra or’ integuments. 
This portion I fhall hereafter call the half cut 
head, for the fake of brevity, fig. 4. a.c. That the — 
divifion may be properly completed, it is requi- 
fite for the {nail to be fully extended, and the 
part then cut clean off with fciflars, making the 
fe€tion perpendicular to the axis of the cone. 
But the operation has not uniformly fucceeded 
according to my defire. The head of the fnail, 
as already obferved, is extremely fenfible, and 
Tcarcely is the touch felt, when it fuddenly con- 
tracts and retires: or, if it is extended, it turns 
about in various directions. ‘Thence the fection 
often fails of fuccefs, if it is made obliquely, and 
the half head is not exadtly fevered. But as J 
judged it of the wtmoft importance, to the accu- 
racy of the experiment, to learn what parts only 
were cut off, that it might be known whether the 
whole would afterwards be reproduced, fhould 
fuch a reproduction actually exift in nature, I 
impofed a labour on mytelf, which I had not 
done 
Se a ee ee 
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