INFUSORIA. 



99 



" There is no microscopic object," says Dujardin, " which excites 

 the admiration of the observer more vividly than the twisting 

 Spirillum " (Fig. 31). He was struck with surprise when he first con- 

 templated this little creature, Avhich, under very high magnifying 







Fig. 29. 



Bacterium termo 



(Miiller), magnified 



600 times. 



The same, 

 magnified 

 1,600 times. 



Fig. 30. 

 Vibrio (Muller), 

 magnified 300 times. 



Fig. 31. 



Spirillum (Ehr), 



magnified 300 times. 



powers only presents the appearance of a thin black line, fashioned 

 like a corkscrew, which every instant turns upon itself with mar- 

 vellous velocity, so that the eye can scarcely follow it. 



The VoIvocmecB were also at one time included among the flagel- 





Figs. 32 and 33. — Volvox globator (Muller), magiiiried 700 times. 



late Infusoria, but now are more generally believed to belong to the 

 vegetable kingdom, they are met with in fresh water full of Confervse 

 and other aquatic plants. The Volvocinece are of a green or yellowish 

 brown colour, with 300 spore-like bodies regularly disseminated in the 

 thickness and near the surface of a gelatinous hollow globe. In this 

 state, from five to eight smaller globules, with the same organisation, 

 appear destined to undergo the same changes when they are released 



H 2 



