Physiology and Biology of the Protozoa. 



493 



each other ; and in a colony swimming straight forwards we 

 see those on the left side striking to the left, and the others to 

 the right, so that a current glides along the left side and 

 another along the right side of the sphere (hg. 16), as has 

 been already indicated by Ehrenberg by arrows in one of his 



figures*. Thus all the individuals of the colony are governed 

 by a common will which is diffusedly inherent in the proto- 

 plasm, and which can only embrace all the members of the 

 colony in this way, because the latter are united to each other 

 * Die Infusionsthierchen, 1838, Atlas. 



