REGENERATION OF FINS OF FUNDULUS HETEROCLITUS. 



regretted that the same author did not include a third series in 

 which the injury was midway between that in A and 

 whether regeneration in that third series would be intermedia! 

 between that of series A and B. Thus Zeleny shows that in 

 cray-fish the greater degree of injury has a stimulating 



regeneration. 



On the other hand Emmel ('04) removed the nght chelipec 

 the lobster immediately after moulting and allowed it to reg 

 erate for the period between moults then removed it again af 

 that moult and allowed it to regenerate. He found that it regen- 

 erated less between moults the more it was mutilated, 

 words Emmel finds in a general way in a nearly allied form just 

 the opposite result to Zeleny. In 1906 Emmel found a decrease 

 in rate of moulting as correlated with greater degree of injury 

 and lesser rate of regeneration, again a contradictory result 

 of Zeleny With a view of testing this question the following 

 periment was devised. Three lots of fishes were taken designated 



as A, B,C. 



In A the caudal fin was amputated. 

 In B the caudal and one pectoral. 

 In C the caudal and both pectorals. 



The fishes were kept in separate compartments in the hatchery 

 with running sea water but were not fed. The experiment was 

 be-un on July 30 and continued until September 4 when all wer 

 removed and measured with fine pointed registering calipers, 

 the following Table I. are found the results of these measure 

 ments. Not only is the length of the specimen given but 

 amount of regeneration and the specific regeneration, 

 term used by Zeleny. Since the specimens differ in length 

 must devise some means of comparing regeneration in one 

 with that in another. We can do this by finding the percentage 

 regeneration in each case, /. e., by dividing the amount of reger 

 eration by the length of the specimen. We may use Zc 

 term and call it specific regeneration. In the table is also giver 

 the weight of each specimen for purposes to be describee 

 Now in interpreting these results we have recourse 

 statistical method. We should apply certain formulae 

 ascertain whether differences in resulting regeneration in t 



