CHOICE OF FOOD IN AMEBA 253 



The time of the beginning and the end of each experiment 

 is given in hours and minutes. In some cases the time of 

 drawing of each figure is also given, and where it is not given 

 it may easily be computed. 



The arrows show the direction of active protoplasmic stream- 

 ing. The arrows in the last figure of each experiment denote 

 the direction the ameba took in moving away from the test 

 object. 



The test objects are labeled in abbreviated form. See table 

 of abbreviations below. For quick and correct reference the 

 test objects are connected with the proper amebas by leader 

 lines. These lines have no other significance. 



All the work was done facing a north window. All the figures 

 were drawn in the same position in the laboratory and on the 

 plates. The top of each plate therefore points toward the north. 

 This is worth noting from the point of view of the possible 

 influence of light on the behavior of ameba. 



It will be noted that there are slight differences in the size 

 and shape of the same test object as drawn in the figures of any 

 single experiment, even if the object was not rolled around by 

 the ameba. The explanation for these differences lies in the 

 speed with which the drawings had to be made in order to catch 

 important items of behavior. As a rule the parts of the ameba 

 lying nearest the test object received the most careful attention 

 and were drawn first; the posterior parts of the ameba and the 

 test object were drawn last. 



For detailed explanation of figures see pages 221 to 231 of 

 the text. 



TABLE OF ABBREVIATIONS 



