284 JOURNAL OF COMPARATIVE NEUROLOGY. 
In most cases an anaesthetic, chlorhydrate, was necessary to 
quiet the violent squirming in making the preparation. De- 
capitation did not quiet these motions. The preparations re- 
sponded with great regularity to single induction shocks of 
moderate intensity applied to the cord 20 to 30 cm. from the 
contracting portion; when the single shock became inefficient 
the interrupted current of short duration was used. The nerve- 
cord-preparation of this species is not easily fatigued and conse- 
quently allows a great number of records to be taken from each 
specimen. The preparation from one specimen, No. 2, Table 
XIV A, gave good responses 23 hours after it was made. 
It frequently happened that an injury to any part of the 
body caused the musculature, both circular and longitudinal, to 
go into a strongly contracted state, in the immediate region of 
the injury. This condition in some cases continued for 24 
hours, or even more, during which time it is practically impos- 
sible to send an impulse through the cord of the contracted 
portion. In the only case in which an impulse passed through 
so small a distance as 100 segments of the worm a strong inter- 
rupted current was necessary. Even in this case the respond- 
ing contractions were feeble and very much delayed. 
EXPERIMENT No. 2, Table XIV A, postero-anterior, July 16, 1901. 
Distal | Proximal 
No. of records 32 32 
Mean latent time 0.18 sec. 0.10 sec. 
Standard deviation 0.014 sec. 0.003 sec. 
Coefficient of variability .08 .03 
Length of cord: 34 cm. (150 segments). Rate: 425 cm. per sec. 
TABLE XIV A. 
Summary of experiments on Glycera rugosa. 
Antero-posterior rate. 
No. of | No. of records Length of | ; 
. ; | Rate in cm. 
experiment \ Distal Proxima! cord in cm. | 
I | 21 22 34 680 
2 | 33 32 34 | 425 
3 II Il 25 357 
4 22 22 20 ‘400 
5 4 | 4 25 500 
6 | 25 25 17 425 
7 | II 11 20 400 
8 12 Il 30 375 
9 9 9 24 | 271 
Mean rate: 433 cm, per sec. 
Standard deviation: 87. 
Coefficient of variability: .20. 
