80 Journal of Entomology and Zoology 
2. Tests to see whether 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 quicker 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. All of these 
tests show that movement is deferred on the injured side. 
Experiment II. Similar results obtained by cutting connective in fourteenth seg- 
ment on right side. 
Experiment 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 IV. Results similar to experiment three obtained by cutting two con- 
nectives between last two ganglia. 
Experiment V. 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 VI. Two alternating connectives cut. Results: 
1. Specimen very active. Tests showed good crossing of sensation paths. 
Experiment VII. 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. Gradually 
the response extended farther down. 
Experiment VIII, Connective cut on left side in fifth 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 thé position of the segment where crossing over took place. 
