18 



Scientific Proceedings (50). 



toward the exit tube. (6) The correct performance of a thoroughly 

 ingrained 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 appro- 

 priately within a few hours after its removal. (7) As the "brain" 

 regenerates, the worm exhibits increased initiative, its behavior 

 becomes less automatic, more variable. (8) Within four weeks 

 after the operation the regenerated segments appear superficially 

 complete and the worm naturally burrows in a mixture of earth 

 and manure. (9) Two months after the removal of the "brain," 

 during the last four weeks of which period no training was given, 

 the habit had completely disappeared from worm No. 2, the 

 subject to whose responses this paper is devoted, and in its place 

 there appeared a tendency to turn in the opposite direction to 

 that demanded in the training. (10) Systematic training for two 

 weeks resulted in the partial re-acquisition of the original direc- 

 tion-habit. 



The general results which have just been stated are subject to 

 modification in the light of additional data. To the experimenter, 

 it seems that the particular individual which has been longest 

 under observation is in many respects exceptional. It is perfectly 

 clear, however, from results obtained with six individuals that 

 important modifications in behavior appear as the result of train- 

 ing. It is equally certain that direction-habits are not readily 

 acquired. 



It is the purpose of the experimenter in the continuation of 

 the investigation to pay especial attention to the relation of the 

 nervous system to modifications of behavior. 



12 (708) 



Preliminary note on the action of glucose upon the amount of 

 epinephrin in the blood. 



By Isaac Ott and John C. Scott. 



[From the Laboratory of Physiology, Medico Chirurgical College, 



Philadelphia.] 



The modern theory of experimental diabetes is that a glyco- 

 secretory center is located in the medulla, from which impulses 



