Of the Wheel Animal. 275 
traced at the Will and Pleafure of the Ani¬ 
mal ; and their Ufe undoubtedly is to pro¬ 
cure it Food, by Means of that Current or 
Vortex which the Motion of them excites. 
They turn not always in the fame Manner, 
nor with equal Swiftnefs, neither is the Ap¬ 
pearance of their Teeth or Notches con- 
flantly the fame : for one (hall fometimes 
fee them moving in contrary Directions, and 
fometimes turning both the fame Way. It 
is alfo not unufual, after they have been 
moving one Way for a conliderable Time, 
to behold them flop on a Sudden and turn 
diredtly contrarywife. Their feeming Ro^ 
tation is fometimes very fad, and at other 
Times very flow; increaling or decrealing 
fometimes gradually, and fometimes all at 
once. 
The Teeth or Cogs of the Wheels feem 
to Hand very regularly at equal Didances : 
but the Figure of them varies according 
to their Pofition, the Degree of their Pro- 
trulion, and perhaps the Will of the Animal. 
They appear fometimes like minute oblong 
Squares riling at right Angles from the Pe¬ 
riphery of .a Circle, like ancient Battlements 
on a round Tower; at other Times they 
terminate in fharp Points, and all together 
refemble a Kind of Gothic Crown. They 
are often feen in a curvular Direction, all 
bending the fame Way, and feeming like fo 
many Books : and now and then one (La 11 
T 2 perceive 
