Effect of Age upon Regeneration 579 
TABLE 7 
Amblystoma jeffersonianum. Nos. 2172-2214. First regeneration. Younger individuals. Regener- 
ation period = 15 days (February 23 to March 10, 1907). Age at time of operation = 34 days 
} | | 
| | | 
CATA- | PARTOF TAIL) TOTAL | LENGTH OF | LENGTH OF rere et Wee 
| AMOUNT OF RATE OF 
LOGUE | REMOVED LENGTH OF | REMOVED | REGENER- | 
REGENERA- REGENERA-~ 
NUMBER | (APPROX.) ANIMAL TAIL | ATED TAIL 
| | TION TION 
pire ew SOM pier Re eae eee gee ee eee Pee eee TL 
| | 
2172 whole 27 «5 ieee Al 6.3 0.56 0.037 
2174 whole 26.0 Ion? | 7.1 0.68 0.045 
2180 whole 25.0 9.0 6.9 (177) 0.051 
2182 whole 27.0 10.6 6.3 0.59 0.039 
21g1 whole 28.0 11.3 BS 0.49 0.033 
2201 whole 27.0 10.2 6.1 0.60 0.040 
2204 whole 22.5 9.6 4.6 | 0.48 0.032 
2213 whole 29.0 11.7 7.0 | 0.60 ©.040 
AVerAge. os]. sion wrens vere | 2b. 10.52 6.22 0.596 | 0.0396 
2183 half 28.0 6.5 4.2 / 0.65 0.043 
2186 half 26.0 5.6 4.2 0.75 0.050 
2196 half 27.0 5:5 208) 0.60 0.040 
2199 half 28.5 6.8 3-9 0.57 0.038 
2208 half 28.0 6.5 3408} o.51 0.034: 
2212 half 26.5 aie & 4.1 0.72 0.048 
a, es, 
