68 NATURAL HISTORY 



Like the three preceding species, little is known of their 

 habits : it is probable that the lighter part about the 

 middle indicates that the animalcule propagates by di- 

 vision: this is also evident by the smaller figure, where 

 a division is perceptible : they measure from 1-lOOOth 

 of an inch in length to 1-lOOth. They are admirably ex- 

 hibited by a doublet magnifier of l-25th of an inch focus. 

 It is worthy of remark, that I have always found it ad- 

 visable to examine these loricated animalcules without 

 the intervention of mica or glass, for when covered they 

 are rarely seen to move. It is also necessary to observe, 

 that they die if any fresh water be put along with them. 



Second Division.— PHYTOZOA. 



97- Vibrio rugulw^. The wrinkled Vibrio, — This little 

 worm animalcule appears a mere wavy inflexible line, as 

 shew^n, greatly magnified, at group 45. It requires a 

 power of near 400 to discover it : its length varies 

 from l-1200th to l-400th of an inch. They usually con- 

 gregate in great numbers, and swim backwards and 

 forwards without altering the inflexions of the body. 

 Found in September, in an infusion containing the Pa- 

 ramaecium aurelia. 



98. Vibrio lineola.'^ The line Vibrio. — These are the 

 smallest worm animalcules discovered by the microscope, 

 are always found in masses, and nearly the first kind that 

 make their appearance in vegetable infusions. In warm 



