INFUSORIA. 
91 
r p k i 
the ml*/ th r 6 cr n eatures ia intensely interesting to the naturalist, 
had a grent r.ri ■ 1, ;' 81Clan ’ and tho general reader. They have 
tion of certain 1 T 81 ®, 116 *° tPcm in Nature, as is evident in the forma- 
traces their action & ° I0C oi lmmense extent, in which the geologist 
teenth eenturt kn ^ vl ®^ re of the Infusoria is traceable to the seven- 
indebted for their di** 6 ^ 6 natliral ‘ s t> Leuwenhoek, we are 
observer sa w t ^ ^ ^76, this 
years later, Baker and Tr lT 6 infusonal animalcules. Fifty 
essayed the first attaint “ b ^ y . studled them anew. In 1752, Hill 
gave them the, name of T f ^ classlficatlon - In 1764, Wiesberg 
great abundance in animd becanSe he found them in such 
lished a special book upon them. ' 10 m f umns - Muller pub- 
as 1 foming a 
ideas changed altogether respecting ’tl',’ " JP ? ° f ° ther classes - Bu t 
power, and armed with achromatic? when micros eopes of great 
Thanks to the labours of Ehror 1 • ^ i't™- employed in their study. 
a better comprehension of the orgLkation ™ have arrived at 
b emgs. Naturalists have establish ^ T ^ mfinitel T small 
»f He zoological group „ Wl , hey J 0 ^ g “ >re to faite 
"f »» to* i. ia only 
abundance. In other waters thev f 1 1 to P rocure them in 
Wn. In general, it is necessarv to s 1 Y’ “ CUp y in g the whole 
is calm, and occupied hy vegetation of 6ar ° * for them where the water 
or lemna, &c., in the marshes and *° me . kmd > ^ as the conferva, 
Infusoria live not only in water hut al a ™ m> ? d 111 tlie sea - Certain 
among tufts of mosses ; in beds’ of osciUc^il on ^f“? y m0ist ’ as 
damp walls. Others live as parasites Z ’ mMSt ®° U ’ or 0,1 ail " 
°f animals, such as hydra hmbri 'i * 10 extenor or mt be interior 
are found in the limiid ’ PI ’/ md naiads - Quantities of them 
e b u lTlr ° fcr P1 ? d ” fa » f •*£ 
Hut as their ‘ V noted even m women’s milk 
