300 



THE BEGINNINGS OF LIFE. 



ments of M. Pouchet. He divides into two equal por- 

 tions a filtered organic solution, favourable for the ap- 

 pearance of ciliated Infusoria, placing the one portion 

 in a tall narrow glass, and the other in a broad flat 

 receiver, so that the former may easily stand in its 



Fig, 69. 



Pouchet's Apparatus for showing that Ciliated Infusoria are 

 derived from the PelHcle. 



centre 1. He then encloses them both under a bell-jar, 

 dipping into water; so that the deep solution and the 

 shallow solution may be exposed to the same air 

 under the one bell-glass. And he has ascertained 

 that^ at the end of four or five days, with a mean 

 temperature of 68^ F, a thick proligerous pellicle is to 



^ See Pouchet's ' Nouvelles Experiences sur la Generation Spontanee,' 

 1S64, pp. 242-247. 



