IV. AND REVIVED. 125 
a powerful magnifier, this point feems compofed 
of a number of infinitely fine fimilar points, 
which are almoft imperceptible, fig. 3. D, there- 
fore, correctly fpeaking, it is thefe points that fix 
the animal. 
The three wheel animals, which I then obferved 
for the firft time, were not fwimming, they crawl- 
ed at the bottom of the drop. _It was foon evi- 
dent that this was their practice when the wheels 
were not in action ; of which any one may be fa- 
tisfied by putting a quantity of fand mixed with 
wheel animals into a watch-glafs half full of wa- 
ter: he will immediately fee, that thofe on the 
furface of the fand crawl over it, and do not 
commit themfelves to the water. The fame is 
the cafe with thofe buried in the fand, when by 
fhaking they are brought to the furface. 
The animals moved attively through the drop, 
fearching as for food among the fand with the an- 
terior parts, but they never went beyond the:con- 
fines of the fluid ; on approaching the circumfe- 
rence, they inftantly returned.—Motion became 
languid as the drop began to evaporate, and the 
languor increafed fo much as to deprive them 
of the power of changing their place; though it 
all dried up, they continued to turn about and 
ftretch themfelves ; fuch motions were moft con- 
fpicuous in the head and tail, which proceeded 
from and re-entered the body, and were entirely 
concealed 
