346 



G. G. SCOTT. 



longer, differing in length from the adjacent groups by one half 

 centimeter, find the average specific regeneration of each group 

 and express the results as follows : 



From this arrangement it would appear that the shortest 

 regenerated 12 per cent, of their length while the longest regen- 

 erated 6 -|- per cent, and that on the whole as the length of the 

 fishes increases the percentage regeneration decreases. On the 

 other hand if we run over the column giving the actual amounts 

 of regeneration we see that in a general way they are much the 

 same for the longer as well as for the shorter fishes. This be- 

 comes evident when we ascertain the average actual regeneration 

 for each of the groups mentioned above. This can be arranged 

 as follows : 



Group 



Av. Reg., cm. 



i 



.60 



2 3 4 56 7 89 10 ii 

 .59 .65 .62 .59 .62 .58 .56 .57 .53 .55 



On examining again the table giving the actual regeneration 

 of each specimen we find some that may be regarded as extreme 

 variants. These are nos. 24 and 33, in which the regeneration 

 is .78 cm., no. 66 with a regeneration of .80 cm. and no. 99 in 

 which the regeneration is .37 cm. 



If we make allowance for these and obtain new averages for 

 the groups in which they occur our series will be as follows. 

 We will disregard the last two groups on account of the small 

 numbers of specimens. 



Group 1234 56 789 



No. of Sp. 6 13 12 7 22 12 14 13 3 



Av. Reg., cm. .60 .59 .63 .62 .60 .60 .58 .57 .57 



If we compare the average regeneration of groups i and 2, 

 representing 19 fishes from 4.5 cm. to 5.5 cm. in length, with 



