224 LECTURE XII. 



tator the magnificent scene in Mr. Walker's 

 Eidouranion, representing numerous worlds re- 

 volving in various directions. 



In a genus called Vibrio, from its vibrating or 

 serpentine form and motion, we meet with the 

 largest of all the Animalcular tribe ; viz. the Vibrio 

 Anguillula or Eel-Vibrio, of which one variety inha- 

 bits acid paste made of flower and water, or such 

 as is used for the common purposes of bookbinding, 

 and the other variety is often found in common 

 vinegar. The paste Vibrio is distinctly visible ta 

 a good eye without a glass, and when full grown 

 measures the tenth of an inch in length : it is vivi- 

 parous, and frequently produces a tribe of young. 

 Its general appearance when magnified is that of an 

 Eel. This animalcule, from its size, and the ease 

 with which it may at all times be kept and observed, 

 is peculiarly interesting. It generally swarms on 

 the surface of the paste, and often coats the sides 

 of the vessel in which it is kept, often forming a 

 kind of ramifications, resembling the branched ap- 

 pearance of frost on a window : this is particularly 

 observable in rainy weather. 



The genus Cyclidium is distinguished by its 

 oval shape, and is among the smallest of Animal- 



