ANIMAL REPRODUCTIONS. 253 
ginning of winter, and care taken that they did 
not perifh with cold, though without being kept 
in a ftove, no reproductive principle appeared on. 
the plane of the trunk ; but it became evident in. 
May, and advanced to perfection during the fum- 
mer months, 
The fame mode: of regeneration prattifed by 
nature in the reproductions of {nails the alfo 
practifes in thofe of newts, of earth worms, and 
water worms; with one variation, however, that 
thefe animals repreduce, though flowly, at the 
temperate degree, which arifes either from the 
great foftnefs. of their fibre, or from fomething 
peculiar in their nature. 
When engaged with the reproductions af 
earth worms, it {truck me to try whether the re- 
productive power was exhautted by the firft re- 
production, and I found that it was not. ‘Thus 
to the fecond reproduction fucceeded a third ; 
and this being taken away, there came a fourth, 
then a fifth, and fo on. Ifa portion of fuch fuc- 
ceflive reproductions were cut off, the fecond re- 
production entered the firft, and the third the fe- 
«cond, &c. Thus I came to havea {cale of repro- 
dudtions united to the old trunk, always younger, 
fmaller, and the colour gradually lighter. 
Thefe regenerations of reproductions equally 
fucceeded in the tail of tadpoles, and, what jis 
more furprifing, in that of newts, and likewife in 
: : their 
