14 



THE UNIVERSE. 



for itself stomachs in its own proper substance and of 

 its own free will! 



The difficulty is to believe that such a theory held sway 

 in France long after the publication of Ehrenberg's 

 magnificent work on the Infusoria, in which the learned 



5. Various Infusoria. 



Prussian naturalist demonstrated, for the first time, that 

 these creatures, notwithstanding their extreme minuteness, 

 possess in some cases a surj^risingly coinj)licated internal 



organization. 



|4 ^'fti Ci i.., C L ^ '"N.-^ 



N;,^^ 





6. Successive forms assumed by the Proteus, 



Their form is, as a rule, fixed, and it is quite an excep- 

 tion that some of them change at will, and present to the 



