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 Pellicle. 



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 



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

 1864, pp. 242-247. 



