252 THE BEGINNINGS OF LIFE. 



With regard to the origin of other Infusoria, we may 

 state that M. Pouchet speaks of the appearance of Vortl- 

 cell<e in different infusions 1 , though he does not give 

 any detailed description of their mode of origin. He 

 describes the cyst as being thicker, and sometimes of a 

 bluish colour, and in his c Heterogenie ' he represents 

 some of the stages whereby a Vorticella of exceedingly 

 simple structure is developed. M. Pineau, however, had 

 previously described the mode of origin of organisms 

 of this type. He saw them arise by a method that 

 seems more closely to have resembled the mode by 

 which Monads are produced than that by which the 

 Paramecia appear. It is quite possible, however, that 

 Vorticella may be evolved after different methods, just 

 as we know that multiple modes of origin are met 

 with in the case of Fungus-spores, Monads, and 

 Amcebse. 



In a maceration of different plants, M. Pineau says, 

 a granular pellicle appeared on the surface, which soon 

 seemed to divide into spherical masses about ^Vir" in 

 diameter. Some of the larger of these, after a time, 

 exhibited motionless, ray-like processes. Elsewhere, 

 globules of a similar character, though more distinct, 

 were seen to have separated from one another. They 

 were now all provided with processes, which, moreover, 

 were seen to exhibit very slow movements, so that in 

 this stage they resembled some varieties of the organ- 

 isms usually called Actmopkrys. As development pro- 



1 'Nouvelles Experiences,' p. 245. 



