314 . ANIMAL REPRODUCTIONS. 
tating during this feafon, but thofe that have nof 
attained the full fize continue without any addi- 
tional increafe: therefore they diminifh both in 
fize and weight, as is evident by examining them 
when they retire in winter and appear in fpring. 
The caufe is manifeft, as, on the one hand, they 
do not feed during the whole of this time; and; 
on the other, their perfpiration is not entirely at 
anend. ‘Therefore every feafon is not adapted 
for the organic evolution of the head, but fums 
mer only and {pring when advanced. 
This Memoir may be terminated with a gene- 
ral reflection. Apparently one chief reafon why 
my difcovery has been fo much called in quef- 
tion, nay abfolutely denied, is, becaufe that dif- 
covery refpeéts the head. Had it been faid that 
an animal was found with the faculty of repro 
ducing the limbs and tail, and that thefe members 
were not of very fimple ftructure as thofe of 
many infects, but nearly of the fame confiftence 
as the limbs of quadrupeds, there is no doubt 
that it might have appeared in fome degree mar- 
vellous. Yet the fact would not have feemed 
fo far from pofhibility. But was it faid that an« 
other animal was difcovered which would repro« 
duce the fevered head, and if this head had eyes, 
mouth, jaws, teeth, tongue, nerves, and brain, 
mot only fhould we be amazed, but the mind 
aftonifhed would revolt and reject the affirmation. 
Thug 
