INTELLIGENCE OF EARTHWORMS 



347 



The most important features of the behavior during this 

 period of rapid regeneration of the " head " will now be described. 



In trial 866 (first of May 4) the worm chose the wrong arm. 

 Unmindful of the sandpaper, it pushed forward until the cut 

 end touched the first electrode, whereupon it suddenly drew 

 back and turned toward the exit tube. That this reaction was 

 due to anticipation of the electrical stimulus is possible, but 

 quite as likely it was due to a chemical stimulus from the copper 

 electrode. 



In 



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Figure 5. Diagram of T, showing path followed by earthworm No. 2 in fifth 

 trial after removal of brain. 



In the very next trial (867) the worm turned toward the 

 right as it left the entrance tube, and, coming to the wall of 

 the stem, pushed vigorously against it, while continuing to 

 move forward, as if trying to round the corner of the stem and 

 right arm before reaching it. To the experimenter, it looked 

 as tho it anticipated the turn and miscalculated the distance 

 by just about the length of the amputated segments. As soon 

 as it reached the angle of stem and arm, it veered sharplv to 

 the right, while moving toward the "common" wall. Upon 

 reaching the latter it pushed against it, stopped for a moment, 



