Grafts Do Not Show Idioplasmic Identity gI 
between different species. In contrast with the results 
obtained by Ollier and Schmitt, the transplantation to 
man of portions of bony tissue and of horny tissue which 
were taken from carnivorous or rodent mammals, has 
been entirely successful. It is known indeed that the 
transplantation of a cock’s comb to a cow’s ear has been 
successfully effected. Born, in his famous experiments, 
has succeeded in transplanting definite parts of young 
embryos of Rana esculenta to corresponding parts of 
other embryos, not only of the same species but also 
of different species (Rana fusca, arvalis and esculenta), 
and indeed of different genera (Rana esculenta and 
Bombinator igneus). °? 
All these experiments show that the plasticity or 
capacity of transformation of living organic substance 
reaches much farther than between individuals of the 
same species. Therefore it cannot be explained by the 
idioplasmic identity of the nuclei, which in any case 
could exist only between tissues of the same individual 
and between individuals of the same species. 
There are certain grafts in plants that appear to 
justify the conclusion that there is a single nuclear 
idioplasm, identical throughout the whole plant. For in 
grafts between plants of the same species there has even 
been obtained the union of parts which have nothing in 
common with each other at all, as for example a root 
with a leaf. Whereas if one attempts to transplant even 
in quite normal relations, parts of plants belonging to 
*1Compare e. g. Oscar Hertwig: Die Zelle und die Gewebe. II. 
P 23; Delage: L’Hérédité etc. P. 114; G. Born: Uber Verwach- 
sungsversuche mit Amphibienlarven. Leipzig, Engelmann. 1897. P. 
146ff, 
