Iv, AND REVIVED. » TAY 
fluid in the inteftines and fkin, were feen by the 
Englith philofopher in his wheel animals ; and 
although he has accurately deferibed them, I 
have been able to find none fimilar in mine, 
_ There is no doubt that I might have feen all thefe 
srgans, both becaufe I ufed Cuff’s microfcope, 
as Baker had done, and alfo fome which were 
much fuperior. With this different organization, 
it is not wonderful that his wheel animals exhi- 
bited anether organ which I have not found in 
mine ; that is, a pair of wheels proceeding from 
the two trunks, whofe revolution produces the 
fame effect as vibration of the fibrilli, and forms 
a moft rapid current, which carries particles to 
the animal’s mouth. It muft be remarked, with 
Baker, that this apparent rotation is not always 
executed with equal velocity, nor in one di- 
rection. Sometimes it is very quick, fometimes 
very flow ; and thefe alternatives are either in- 
ftantaneoufly or gradually effeted. The animal, 
at one time, turns to the right or the left ; and, 
after moving long at one fide, it often interrupts 
the vortex and begins it in a part aoe nat 
oppofite. 
Let us leave this brief digreffion, and return to 
our animals. They no longer crawl at the bot- 
tom when the fibrilli appear, but fwim through 
the whole fluid with the greateft velocity. Ex. 
amining them while in the act of fwimming, I 
have 
