CU 429) 4 
CLASS XIV. INFUSORIA. 
Remarks. Cuvier says, itis customary to place, 
at the end of the animal kingdom, those minute be- 
ings, which escape the natural eye, and which 
were never distinguished, until after the micros- 
cope had developed a kind of new world. They 
generally present gelatinous bodies extreniely sim- 
le. These may be arranged together with pro- 
priety. But many animals are placed here, mere- 
jy on account of their minuteness. Those of this 
description will probably be removed from this 
class, after farther investigation. 
Enfusory animals are best examined under the 
solar microscope. ‘To prepare them; steep in 
cold rain water almost any vegetable, for several 
hours ; then expose this infusion for a day or two 
to.the sun’s rays, In a situation to bring the tem- 
perature to that of common river water in the sum- 
mer months. Ifa drop of this is put upen a piece 
of glass, or between two pieces, placed in the fo- 
cus behind the lens of a solar microscope, the 
animalcula will soon appear on the screen. 
ORDER 1. ROTIFERA. 
Bodies oval, gelatinous ; having mouths, stom- 
achs and intestines ; often having a kind of tail, 
and two prominences upon the neck appear te 
bear eyes, and organs are seen which appear to be 
concerned in respiration. 
VortTiceLua, (whirler,) body contractile, nak- 
ed, and furnished with ciliate, rotatory organs. In 
all waters. 
