Members of the Aquatic Salamander. 91 



It would seem, also, that whether one or all the members are 

 to be reproduced at the same time, the process goes on with equal 

 rapidity. 



It was natural to inquire whether reproduction was a property 

 possessed generally by the other parts of this animal, or whether 

 it was strictly confined to those members in which it has been de- 

 scribed. The results of my researches only warrant me in stat- 

 ing, that this power is possessed by the extremities, the tail, the 

 lower jaw, and the crest of the male. I have looked for it in vain 

 in the eyes, although I have watched the changes in the part for a 

 very considerable time after cicatrization. I have never observed 

 it in any of the internal organs ; nor have I been satisfied that it 

 takes place in the bronchine of the young animal. When any 

 other parts of the body, except those capable of reproduction, are 

 removed, the healing process proceeds as in other animals, leaving 

 a cicatrice, unequal and depressed, which is never obliterated. 



It was also an object of my researches to discover whether re- 

 production commenced in any particular structure in preference to 

 the others. To these inquiries I have always received a negative 

 answer, leading me to conclude, that the reproducing vessels are 

 contributed by all the structures. This, however, was not the case 

 when the inquiry was pursued conversely, so as to determine the 

 influence of the arterial and nervous system on the growth of the 

 new production. As relates to the former, my observations were 

 less conclusive and satisfactory, but concerning the latter, per- 

 fectly conclusive. 



If the sciatic nerve be intersected at the time of amputation, 

 that part of the stump below the section of the nerve mortifies, re- 

 production following the cicatrix in the usual manner. If the di- 

 vision of the nerve be made after the healing of the stump, repro- 

 duction is either retarded or entirely prevented. And if the nerve 

 be divided after reproduction has commenced, or considerably ad- 

 vanced, the new growth either remains stationary, or it wastes, 

 becomes shrivelled and shapeless, or entirely disappears. This 

 derangement cannot, in my opinion, be fairly attributed to the vas- 

 cular derangement induced in the limb by the wound of the divi- 



