REGENERATION IN FUNDULUS. 



347 



the average regeneration of groups 8 and 9, representing 16 

 fishes from 8.O cm. to 9.0 cm. in length, we find that there is a 

 difference of but .025 cm. Again, if we compare the average 

 regeneration of groups 2 and 3, representing 25 short fishes, 

 with that of groups 7 and 8, representing 27 longer fishes, we 

 find a difference of but .035 cm. The relation of the specific 

 regeneration to the actual regeneration is represented by the fol- 

 lowing diagram (Fig. i) in which the base line represents the 

 length of the fishes the upper curve AB was formed by 

 joining the points representing the specific regeneration in the 

 various groups and therefore represents the relation of the 

 specific regeneration to length. The lower curve, C-D, was 

 formed by drawing a line through the points representing the 

 actual regeneration in the various groups and therefore repre- 

 sents the relation of the actual regeneration to length. It is to 

 be noted that while on the whole the curve representing relative 

 specific regeneration falls, at the same time the curve represent- 

 ing the actual regeneration remains almost parallel with the base 

 line although it will also be noted that there is an indication of a 

 slight decrease in regeneration. There is a strong indication, 

 however, that the longer fishes have regenerated almost as much 

 tissue as the shorter in the same length of time. 



But what is the condition in the case of the Fnnduhis majalis 

 the results of the experiment with which are given in Table II. 

 On arranging the results in a way similar to that used in the case 

 of Fnndnlus Jieteroclitus we have the following : 



Here again it will be observed that there is a gradual decrease 

 in the specific regeneration. The number of specimens in groups 

 i, 6, 7 and 8 is so small that too much value must not be placed 

 on them. Although the total number of specimens is smaller in 



