1 82 MAN, — THE ANIMAL 



was seldom directly stimulated and usually took 

 the right turn with a fair degree of accuracy. 



In view of the positiveness of these results, he 

 next tried an unusual experiment, i.e., he cut off 

 that part of the body containing the "brain." 

 These worms are able to regenerate such lost parts 

 and the idea was to determine whether the pre- 

 viously acquired habits were located in the brain or 

 generally distributed in the nervous system. Forty 

 hours after the operation, the lessons were begun 

 again. "The worm moved forward, more slowly 

 and continuously than before the operation, into 

 the middle of the stem. Having reached the 

 common wall of the arms it turned to the left and 

 five times pushed forward to the sandpaper, each 

 time withdrawing upon contact. As it searched 

 with the cut end for a way of escape, the 'tail,' 

 became active and moved about as if 'feeling' for 

 a path. Shortly a turn toward the right was made 

 and, with repeated attempts to crawl up the glass 

 wall, the worm approached the exit tube. The in- 

 stant the 'head' end came in contact with the moist 

 lining of the tube the worm pushed forward as in 

 'recognition' of the retreat. 



"The correct performance of a thoroughly in- 

 grained habitual act of the kind studied in this 

 investigation is not dependent upon the 'brain' 

 (portions of the nervous system carried by the five 

 anterior segments), since the worm reacts ap- 



