LY. AND REVIVED. 163 
x. ‘The reverfe fucceeds when the ‘loth is -re- 
vived by fupplying water. As the wheel animal 
can only revive a certain number of times, fo it is 
with the floth. And, although fand is neceffary 
for its refurrection, it does not appear fo eflential 
as for that of the wheel animal. 
The degrees of heat, fatal to revived or dead 
wheel animals, are alfo fatal to floths; and the 
fame may be faid of odours and liquors. ‘Cold, 
however intenfe, does them no harm, and in ‘this 
they likewife coincide with wheel animals. 
Sloths are infinitely more rare than wheel ani- 
mals: for five and twenty of thefe, four or five 
floths are hardly found. All are of the fame 
figure, but not equal in fize. I have ifolated 
many in watch-glaffes, fometimes with fand and 
Yometimes with pure water, intending to difcover 
their mode of propagation, but, inftead of multi- 
plying, all perifhed : fome fooner, fome later, 
none ever attaining the fixth day (1). | 
L2 The 
(1) This animalcule is uncommonly rare. I have never 
feen a defcription of it by any other naturalift: and it 
only occurred to me in two infufions. Miuller’s Cercaria 
flirta, which he found but twice, feems to have fome refem- 
blance, but he does not fay enough of the properties to 
afcertain it, nor does he remark any feet. I had mine 
from June until the following February. They were 
very 
