INFUSORIAL ANIMALCULES. 5 



1. All the Infusoria are organized, and the greater part 

 of them (probably all) are highly organized bodies. 



2. The Infusoria constitute two very natural classes of 

 animals, according to their structure, which classes admit 

 of subdivision, upon the same principle. 



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

 the globe, and the sea, is proved 5 as also that of indi- 

 viduals of the same species in the most opposite ends of 

 the world. 



4. The geographical distribution of the Infusoria upon 

 the earth follows the laws observed regulating that of other 

 natural bodies. 



5. Most of the Infusoria are invisible to the naked eye; 

 many are 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 

 their immense 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, through living in dense and crowded masses. 



9. In a cubic inch 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 organised 

 bodies. 



11. From one of the known propagative modes of the 

 Infusoria that is, of self- division a continual destruction, 

 beyond all idea, of the individual, and a similar inter- 



