468 Oren E. Frazee 
They were measured May 6, 1909, and operated upon the fol- 
lowing day, when from 5.5 to 8.5 mm., of the tail were removed. 
Upon the same day, i. e., day of operation, 17 were stimulated 
for one hour. Current density, 8.3 6. Voltage 110. 
Six larve did not survive the shock of the cutting and cur- 
rent, and died within an hour after the stimulation. The remain- 
ing ones of the stimulated set were much depressed, would not 
eat for several hours, and were not easily disturbed. Three 
days after stimulation, they appeared shrunken as compared 
with the ones in the non-stimulated set. They were at this 
time, however, just as active apparently as the ones in the non- 
stimulated set. Regenerated tissue, under the microscope looked 
alike in both sets. Five days after the stimulation the stimulated 
individuals looked and behaved in a manner quite similar ‘to 
the non-stimulated individuals. 
Tables VIII and IX show the various measurements taken. — 
In general the advantage is in favor of the non-stimulated set. 
{t is noticeable, however, that the stimulated ones hold their own, 
and with the return of bodily vigor the rate of regeneration 
increases. 
An examination of these measurements shows: 
1 That three days after stimulation the individuals of the non- 
stimulated set had regenerated on the average 0.03 + mm., 74 
per cent more than the individuals of the stimulated set. See 
‘Tables VIII and IX, measurement number one. 
2 That five days after stimulation the individuals of the non- 
stimulated set had regenerated on the average 0.09+ mm., or 
8+ per cent more than the individuals of the stimulated set. 
See Tables VIII and IX, measurement number two. 
3 That seven days after stimulation the individuals of the non- 
stimulated set had regenerated on the average 0.06+ mm., or 
2% per cent more than the individuals of the stimulated set. See 
Tables VIII and [X, measurement number three. 
4 That nine days after stimulation the individuals of the non- 
stimulated set had regenerated on the average 0.035 mm., or 
I + per cent more than the individuals of the stimulated set. See 
‘Tables VIII and IX, measurement number four. 
