470 | Oren E. Frazee 
Experiment 9. In this experiment 36 tadpoles of Rana pipiens 
ranging from 14 to 18.1 mm. in length were selected. ‘They were 
measured and operated upon June 1, 1909, at which time 4.5 
to 7 mm. of the tail were removed. ‘The following day 18 were 
stimulated forone hour. Currentdensity 50. Voltage,40. They 
were measured two and four days after stimulation. 
TABLE IX 
Table showing the four measurements of regenerated tails in both sets, arranged in order of amounts, to- 
gether with the totals and averages 
_— Ee 7 pesee : pt | 
mi M? M3 mi 
MAY 10 MAY I2 MAY 14 | MAY 16 
Non-stim. | Stim. | Non-stim. Stim. | Non-stim | Stim. | Non-stim. Stim. 
0.33 Oe) bo. 0.75 T6059) yaa. 2a 235 
Oy |) (One) 0.9 | 0.75 7) hy 2.55 2.5 
0.39 | 0.35 9) 0:95) | 1.0 | 1.8 1.85 | 2.6 2.5 
0.39 | 0.35 0.95 | Bro Who} 30g DOS. peat Zine 
0.39 Ong TOs TsO) | i 1.9 1.95 2.7 2.9 
0.4 O.4 | 1.0 igh rae 2; 2.95 gle! 
0.4 | 0.4 I.1 I.1 2.1 2.1 3 3-2 
0.4 0.42 E25 1.25 el eee art BE25 
0.4 0.45 Ig | es) ar 2.45 3-1 3 +4 
0.4 0.49 rae it) 22 225 ho! 3.6 
0.42 0.49 iRise) Teoh iz, Deals 32 3.6 
0.45 | 1.3 Pid 302) 
0.47 itn) | 233 3:3 
0.48 1.35 2235 shoe! 
0.48 | 1235 | tn 3-5 
0.49 1.4 Daly Bobs 
0.5 | 1.45 2.8 BEd 
7-14 4-30 19.60 | 11.90 36.40 22.95 | 51.70 33-10 
Av.0.42 39+ 1.17+ | 1-08) | 20-451 2.08+ 304+ 3009+ 
| | 
The stimulated ones at no stage seemed to show any indica- 
tion of depression, but on the contrary they appeared just as 
vigorous and plump as those of the non-stimulated set. 
Tables X and XI show the various measurements taken. A 
distinct advantage is shown in favor of the stimulated set. 
