80 Journal of Plntomology and Zoology 



2. Tests to see ivlieilier stimuli carried from tail end to head end on injured 

 side. Anal leg pinched. We have the suggestion in this that the impulse travels up 

 and crosses over to the opposite side at the injured point, causing the head to turn 

 to the right. On the uninjured side the impulse is able to travel up without crossing. 

 The reaction was <|uicker than on the injured side. 



3. Acetic acid on antennae of injured side. Reaction on opposite side at anal 

 end first. Acetic acid on antennae of uninjured side. Reaction on same side at 

 anal end. 



4. When stmulated below cut, both sides respond equally well. .\\\ of these 

 tests show that movement is deferred on the injured side. 



Experimrnl II. Similar results obtained by cutting connective in fourteenth seg- 

 ment on right side. 



ExprrimenI III. Cut two connectives of twelfth segment. Results: 



1. Specimen was turned on its back. It could turn over above injury without 

 aid, was helpless back of injury. 



2. Moved legs vigorously above injury; dragged others. 



3. Antennae sensitive to touch, causing response back to injury. 



Experiment II'. Results similar to experiment three obtained by cutting two con- 

 nectives between last two ganglia. 



Experiment I'. Connectives cut between brain and sub-ganglion. Results: 



1. Stimulated antennae. No response. 



2. Stimulate anal leg. Impulse traveled along slowly, causing all legs to move. 

 This seems to be a muscular reaction rather than one controlled by the nervous system. 



3. One response in which I was very much interested was that the centipede, 

 as a result of this particular experiment, reversed movement with apparent ease. 



Experiment I' I. Two alternating connectives cut. Results: 



1. Specimen very active. Tests showed good crossing of sensation paths. 



Experiment I'll. Four cuts alternating excepting for second cut. Between cuts 

 one and two connectives not severed on either side. Results: 



1. Test to see whether stimuli carried to brain. Very slight stimulus at anal 

 leg, caused only reaction in legs back of injury. Strong stimulus, caused stimulus 

 to go to brain but it was very slow, due to the number of injuries. The stimulus 

 had to cross at several points. 



2. There is apparent separation of brain from anal end by injuries. The legs 

 in front of injuries in constant motion, while those in back are quiet. 



3. Stimulated head region. Result is a very active reaction, which takes place 

 almost immediately, back to the injured part. There was much delay here. CJradually 

 the response extended farther down. 



Experiment I'lll. C<mneclive cut on left side in tifth segment from head. Con- 

 nective cut on right side in fourth segment from tail. In this experiment I wanted 

 to test for time of response when cuts are on opposite sides and quite a distance 

 apart. Results: 



1. Anal legs stimulated. On the right side it took longer for the response at the 

 head end. On the left side it was carried immediately to brain. This was probably 

 due to the position of the segment where crossing over took place. 



