Chap. XXTII. OF PANGENESIS. 359 



same genns, the aquatic salamander, has extraordinary powers 

 of re-growth, as we have just seen ; and this animal is 

 eminently liable to have its limbs, tail, eyes and jaws bitten 

 off by other tritons. 24 Even with the aquatic salamander 

 the capacity is to a certain extent localised, for when M. 

 Philipeaux, 25 extirpated the entire fore limb together with 

 the scapula, the power of re-growth was completely lost. It 

 is also a remarkable fact, standing in opposition to a very 

 general rule, that the young of the aquatic salamander do not. 

 possess the power of repairing their limbs in an equal degree 

 with the adults; 26 but I do not know that they are more 

 active, or can otherwise better escape the loss of their limbs, 

 than the adults. The walking-stick insect, Diajjheromera 

 femorata, like other insects of the same order, can reproduce 

 its legs in the mature state, and these from their great length 

 must be liable to be lost : but the capacity is localised (as in 

 the case of the salamander), for Dr. Scudder found, 27 that if 

 the limb was removed within the trochanto-femoral articula- 

 tion, it was never renewed. When a crab is seized by one of 

 its legs, this is thrown off at the basal joint, being afterwards 

 replaced by a new leg ; and it is generally admitted that this 

 is a special provision for the safety of the animal. Lastly, 

 with gasteropod molluscs, which are well known to have the 

 power of reproducing their heads, Lessona shows that they 

 are very liable to have their heads bitten off by fishes ; the 

 rest of the body being protected by the shell. Even with 

 plants we see something of the same kind, for non-deciduous 

 leaves and young stems have no power of re-growth, these 

 parts being easily replaced by growth from new buds; whilst 

 the bark and subjacent tissues of the trunks of trees have 

 great power of re-growth, probably on account of their increase 

 in diameter, and of their liability to injury from being 

 gnawed by animals. 



24 Lessona states that this is so in v. p. 294, as quoted by Prof. Rolleston 

 thi! paper just referred to. See also in his remarkable address to the 30th 

 * The American Naturalist,' Sept. annual meeting of the British Medical 

 1871, p. 579. Association. 



25 ' Comptes Rendus,' Oct. 1, 1866, 27 ' Proc. Boston Soc. of Nat. Hist, 

 and June, 1867. vol. sii., 1868-69, p. 1. 



26 Bonnet, ' (Euvres Hist. Nat.,' vol. 



