Effect of Successive Removal upon Regeneration 497 
& Food. A superabundance of food was always at hand in 
each individual dish. 
g Individual Variation. An attempt was made as in the 
salamander series to keep the minor details alike in all cases. 
There is, however, a considerable amount of individual variation. 
Unfortunately the peculiar necessity of grouping individuals which 
results from the molting habit makes the number of individuals in 
any single comparison much smaller than is desirable. 
Data. In Table 11 all but two of the seven first regeneration 
individuals have a specific amount of regeneration between 0.45 
and 0.50. Likewise, all but three of the fifteen third or fourth 
regeneration individuals have specific amounts between 0.45 and 
0.53. The exceptional individuals are all below the ordinary 
level and may be explained on the basis of infection of the wound 
or other uncontrolled factor in the conditions of the experiment. 
Similarly in Table 12 no striking difference between the rates is 
apparent. 
TABLE 12—CamBarus BARTONI 
Both chele removed 
FIRST OR SECOND REGENERA- | THIRD OR FOURTH REGENERA™ 
| TION TION 
| 
n | ll 
a AS: 4s 
5S) | ae) 
=] a ca 2 Wea | = L uv 
s oo ye ES oe oo I ° Aire 
< PERIOD 5 eo. oR fo) a uo ow amt ro) 
Raz = ee vo » = 4 = o | wo 
zs ao | & ag 3 Bam | & =| & 
a 6 2 ao Ole ees a hm 2 = 21 1S 
Cs) 3} oa) 65 o 33 8 o & | & o-5 
725) 3 uO = = =| A e 9 og as 
ms | we 2 | uw %& os) <s 
ie} oa)| 8s HASSE bie & oa | 8s 3a 
3 Bree ele A= oa | = GS | 8 6|/ 8 8 
— fp 0) | Go l= & — eon Se eS eet eo 
S ac | &S$/| 8 o s aS | &3| 3 oa 
a OO our Sian ik AS} on 9 S| 2 & 
ica = iad n es 4 a4 |” 
| 
11-3 | 5-05 | 22 | 0.45 | 11.5 5-4 | 30 | 0.47 
| 
11.6 ye) O. 26 | oO. 
Ist and 3d BERG. se 4-3 | 3 37 | 53 45 
11.9 5-45 | 27 0.46 
| gO) 25-95 |" 25), apo 46 
| 
2d and 4th | 6to7 12.6 | 5.1 | 19 | 0.40] 13.0 Bas 22 O42 
1st and 4th | 7to8 rer Me CORE I Eero) 0.49 | 
Ist and 3d | 5to7 | T2240 | Oe 75 52s TOL ne 
12.8 6.7 AT On 52 
} U 
