c 



Fig. 72. Another Kind of Oil-Drop Freshly Prepared from 



Rabbit Brain 



If the brain oil is placed in a more alkaline solution, the shape of the 

 drop varies considerably. It is no longer round but shows an irregular 

 contour, closely resembling that of a real Amoeba with broad pseudopodia 

 protruding from it (Fig. 66). In order to develop these protrusions the 

 oil-drop needs nourishment and air or respiration, as does the Amoeba. 

 The pictures are of the same oil-drop, all magnified 400 times. A at the 

 beginning; B three hours later; C six hours later; and D nine hours later. 

 The slow protruding and retracting of the pseudopodia can be distinctly 

 observed. 



E is a diagram of this oil drop; dotted lines indicate the extension and 

 retraction of the "pseudopodia". 



179 



