ANIMAL REPRODUCTIONS. 327 
ed 8 May, whofe head is reprefented, fig. 1. 
On the 6 of July, when it was defigned, the re 
production had made very little progres, fig. 12. 
Though the origin of the large horns is vifible, 
they do not yet begin to extend: indeed, the 
eye alone, which is already perceptible, indicates 
their place: it appears like a minute black 
point, fuch as it is poflible to make with the 
fineft pen. ‘The {nail was drawn when ftretched 
to the utmoft, and I have ufed the fame precau- 
tion with all the reft: In that of whith I now 
fpeak, neither the {mall horns nor mouth yet ap- 
pear. 
When the large horns are retratted, the black 
point or eye is eafily perceived within through 
the flefh. I have frequently difcerned it with my 
naked eye, and even in thofe {nails whofe repro- 
duction was very little advanced. 
I fhould not neglect to oblerve, that of the 
twelve {nails decapitated 8 May, only one died. 
All the reft ftill feem to be well, 27 July: but 
the progrefs of reproduction is very various. In 
fome, it is no more than begun: in others, the 
large horns alone are repaired, the origin of the 
{mall ones is imperceptible, and the mouth is ill 
defined. Some of the large horns are only a half 
or two-thirds of a line in length. Such are thofe of 
the fnail, which has hitherto been diftinguifhed by 
the letter A: the anterior part, as it appeared 2: 
& 4 June, 
