Effect of Successive Removal upon Regeneration 489 
TABLE 6a—AmMBLyYsTOMA JEFFERSONIANUM 
Series IIIa. (Individual Data) 
Approximately two-fifths of tail removed. Regeneration period equals ten days. 
FIRST REGENERATION FOURTH REGENERATION 
Length of removed tail | First regeneration Length of removed tail | Fourth regeneration 
| 
8.4 1.6 6.2 1.0 (—) 
8.5 lhe 2.2 9-9 2.0 
9.8 Dep 10.1 Pie) 
10.2 | 1.0 (—) 10.4 | 1.9 
10.7 | 257 
| 
9.22 | 1.75 9-46 | 1.96 
TABLE 6b—AmBLYSTOMA JEFFERSONIANUM 
Series IIIa. (Results) 
A — ee t _ 7 s5® 
_ AVERAGE SPECIFIC | AVERAGE SPFCIFIC 
| AMOUNT | RATE 
MinsprepeneratlOn——TOUrGASes ass) afer) yale. sta\= 01 e/ate) 2 sfolelarstaters | 0.190 0.0190 
ourchtrepeueratl One fiVveiCases lcs seltciset-/-1s\-/<fal+)s/s/aleia) sere = | ©.207 ©.0207 
| | 
Increase withisuccesstve TEMOV Als). e/c ccc Saide sees sens eee) + 0.017 + 0.0017 
Pericentigimnereasecsrcpysyereva ere es oes stere. kaise is. als =: syeragese ck 9 per cent 
TABLE 7a—AMBLYSTOMA JEFFERSONIANUM 
Series IIIb. (Individual data) 
Approximately four-fifths of tail removed. The regeneration period is ten days. 
FIRST REGENERATION | FOURTH REGENERATION 
Length of removedtail | First regeneration | Length of removed tail. Fourth regeneration 
16.7 3.0 18.0 a2 
nga | Les 18.1 4.1 
ia? | 2.8 | 18.5 3.8 
18.8 4.0 | 18.6 3-9 
19.0 ehoy/ 19.2 3.8 
WIG 4-4 | U8) 207) 
og) 4-3 | 19.6 | B05 
20.1 | 3.8 | 20.2 | ay) 
20.3 4-4 
| 21.2 4.6 
Average........- 18.65 | 3°44 19. 
Ww 
rs) 
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(e) 
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