340 



i;<>i;i;i;t m. yekkes 



contact with the right wall of stem it rapidly moved forward 

 to junction of arms. It then veered sharply toward the exit 

 tube. On reaching the "common" wall it stopped and felt 

 about for a few seconds, making no attempt to reach up or 

 to swing from side to side. In this the behavior is unusual. 

 After a few seconds it started for the tube, gradually ascending 

 the wall of the arm as it approached the exit." The trip was 

 a quick one, in which only the unusual features have been 

 mentioned. 



In 



Tr. 861 



Hr 9-16 



P. 5 E 



Tm. 501' 



?L-Aj 



Figure 4. Diagram of T, showing path followed by earthworm No. 2 in first 

 trial after removal of the brain. 



The third trial, at 9:52, and the fourth, at 10:03, yielded 

 results similar to that of the second. But in the fifth, 10:15, 

 the path for which appears in figure 5, the worm followed the 

 left wall of the stem instead of the right, felt about at the point 

 of contact with the "common" wall, finally turned toward 

 the exit, and, with frequent attempts to crawl over the wall 

 of the arm, approached, reached, and quickly entered the tube. 



Following this first series of trials with the "brainless" worm, 

 at intervals of from two to seven days, additional series of 

 five trials each were given until June 7. The general results 

 appear in table 7. 



