IKTUSORIAL A:^IMALCriES. <* 



tion of the SpjTogyra resembles that of some of the species of 

 rimgi. 6. They derelope acicnlar crystals A\'ilhin themselves, like 

 some well-known plants. 7. Their motion is not perceptibly volun- 

 tary. (See section IV.) 



For the convenience of reference, it is proposed to divide this part 

 into sections; and, although the subjects treated of may not, as 

 respects some of them, have received all that careful investigation 

 v.hich they deserve, yet it is presumed that sufficient has been done 

 to lead the minds of the more curious inquirer to a further research. 

 Previous to which, I present the reader with Professor Ehrcnbcrg's 

 summary' of the suhject : — 



1. All the Infusoria arc organized, and the greater part of them 

 (probably all) ai-e highly organized bodies. 



2. Tlio Infusoria constitute two very natural classes of animals, 

 according to their structiu'c, v>'liich classes admit of subdivision, 

 npon the same principle. 



3. The existence of the Infusoria in the four quarters of the 

 globe, and the Bca, is proved ; as also that of indi\'idual9 of the 

 same species in the most opposite ends of the worid. 



4. The geographical distribution of the Infusoria upon the earth 

 follows the laws observed regulatbig that of other natural bodies. 



5. Most of the Infusoria are invisible to the nalccd ej-c ; many 

 arc visible as moving points ; and the size of the body does not 

 exceed, in any case, the l-12th of an inch. 



6. The minute invisible Infusoria, in consequence of tlieir im- 

 mense and swarming numbers, colour large tracts of water with 

 very remarkable hues. 



7. They give rise to one kind of phosphorescence of the sea, 

 though in themselves invisible. 



8. They compose (though singly invisible) a sort of mould, 

 tlrrough living m dense and crowded masses. 



9. In a cubic iach of this mould, more than 41,000 millions of 

 single animals exist, and constitute, most likely, the chief proportion 

 of living bodies upon the face of the earth. 



10. The Infusoria are the most reproductive of organized bodies. 



1 1 . Prom one of the kuo-wu propagative modes of the Infusoria — 

 that is, self-division — a continual destruclion, beyond all idea, of the 



