ANIMAL REPRODUCTIONS. 241 
dy greater where moft part of the head has been 
cut off: and, in fome fnails, an enormous wound 
appears on one fide, though nothing is vifible on 
the other, or only the afh-coloured line. And 
although length of time eflaces the incavation, 
{till the indication of the cut, that is, the line, 
will fometimes remain two years: nay, even after 
fo long an interval, the head is not always com- 
plete, for it may want one or more horns; or 
thefe, at leaft the whole, have not attained the 
proper fize, or are gibbous and monftrous. Such 
monitrofity having frequently occurred, I am in- 
clined to fufpe&t that it originates from the ob- 
liquity of the cut, or from being more or lefs 
advanced on the neck. 
The moft indubitable proof of regeneration 
feemed to be -when the heads began to feed. 
However, I was defirous of convincing myfelf by 
the infallible affiftance of anatomy, which has al- 
ways demonftrated that the new heads, which 
externally feemed to be completely reproduced, 
were provided with all the conftituent parts that 
I had found in the old heads, which, in each de- 
capitation, had been enumerated to avoid doubts 
and errors. I may add further, that each new 
part united, and fo exactly applied its moft fubtile 
fibres to the old, that we fhould never have 
known the {nails were mutilated, had it not been 
Vou, II. Q. indicated 
