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 when 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 strvchin, in which 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 
speak 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 h 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 
