AXIAL GRADIENT IN CILIATE INFUSORIA. 



43 



of the whole peristome (Fig. 12) and the body may remain 

 otherwise intact for several days. The changes in ethyl ether 

 2 per cent, are very similar. In a small vorticellid of which only 

 a few individuals were present in my cultures the death changes 

 consisted of the bulging of the peristome (Fig. 13) and later of 



8 



the disappearance of the cilia and the swelling of the cytoplasm 

 until it formed a large rounded mass still enclosed within the 

 stretched membrane of the peristome region (Fig. 14) while the 

 lateral body-wall retained its form. In higher concentrations 

 the changes in this form would undoubtedly be the same as in 

 Carchesium. 



