84 REPORT OF COMMISSIONERS OF INLAND FISHERIES. 



A kind of regeneration like this hardly less excites our envy than our 

 imagination; if, in place of a lost leg or arm, another would grow out 

 again, one would be more willing to adopt the profession of the 

 soldier."* 



Reamur also noticed that the time necessary for the reproduction 

 of new limbs varied with a number of conditions, such as the seasons 

 and the temperature of the water — regeneration being more rapid 

 in warm than in cold water; and legs broken off in winter did not 

 grow out again until summer. He also cut off the tails of crayfish, 

 but did not find that they were renewed. 



Chantran, in the study of crayfish, made some observations upon 

 the regeneration of the antennae and eyes. 



Herbst made his experiments upon decapods and isopods. He 

 obtained some very interesting results in the regeneration of the eye. 

 In place of an eye, he often found a new antenna-like organ. From 

 his experiments he arrived at the conclusion that the presence or 

 absence of the optic ganglion was thie factor determining whether an 

 eye or an antenna-like organ shall be reproduced; and if the optic 

 ganglion is present the eye would be renewed, but if gone an antenna- 

 like organ may be regenerated instead of an eye. 



Miss Steele made a careful study of the regeneration of crayfish 

 appendages. She succeeded in obtaining some interesting repro- 

 ductions of antennae-like appendages in place of the normal eyes. 



Herrick, in his work on the American lobster, has given a concise 

 account of his observations upon the regeneration of the chilipeds, 

 antennae, and some of the thoracic appendages. Brooks also studied 

 regeneration in the European lobster — Homariis vulgaris. Some of 

 the results of both Herrick and Brooks yAW be referred to again later. 



Morgan experimented with the hermit crab to determine whether 

 there was any relation between the power of regeneration and the 

 liability to injury. His conclusion is that there exists no necessary 

 causal connection between the two. 



Such, in brief, is the nature of some of the observations which have 



*IIerrick. Bulletin of U. S. Fish Commission 1895, p. 103. 



