Dec, 1907.] Regeneration and Inheritance. 219 



the regenerated tissue perfectly transparent ; now it is the regen- 

 erated tissue which is all covered up with chitin and the old 

 tissue became transparent. 



We have here thus a case of transmission of materials from 

 all parts of the old tissue to provide for the building up of the 

 new tissue, and, as we mentioned above, the material may come 

 either directly from the region near the cut surface or from the 

 remotest portions. 



In those worms where the chitinous covering was absent 

 before the operation, the dorsal surface of the new, regenerated 

 tail also remained free of such a covering. The same thing hap- 

 pened w^hen worms, which bore a layer of chitinous material on 

 their dorsal surface, were subjected to the action of a 0.0001 

 per cent, solution of strychin, in w^hich case the chitin disap- 

 peared from the old part, and has never been deposited in the re- 

 generated part, indicating that the regenating organ is dependent 

 on the old tissue for its building material. 



This fact here related, as well as others of which I cannot 

 spsak now, point to the assumption that it is the organism as a 

 whole and not the exposed, cut surface of the organism that is 

 concerned with the regeneration of the lost tissue. 



REGENERATION AND INHERITANCE. 



Sergius Morgulis, a. M. 



When a gold fish which happens to have a black band across 

 its tail regenerates a new tail with the black band in the same 

 position, after the latter has been removed, we may speak of 

 this in a general way as being a case of inheritance through regen- 

 eration. In the same loose sense we may .speak of the regenera- 

 tion of an antenna instead of an eye, in certain crustaceans, and 

 of the regeneration of antennae instead of legs in insects as cases 

 of reversion. 



Such cases, however, cannot be considered as hereditary 

 phenomena sensu strictu, in the same sense as the term is being 

 used to indicate a tranmission of a character from one indivi- 

 dual to another. It is only through a comparative study of the 

 regeneration of regenerated tissue and of that of the original old 

 tissue by which the regenerated tissue was produced, that we 

 may get a clue as to the transmission of characters in the regen- 

 erative process. 



The great difficulty which presents itself in such a comparative 

 study lies in the fact that while a great many animals do possess 

 the power to regenerate an amputated portion or organ of their 

 body, the lost organ and also the new organ regenerated in its 

 stead do not possess the power to regenerate the whole animal 



