Grafts Do Not Show Idioplasmic Identity 91 



between different species. In contrast with the results 

 obtained by Oilier 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). 61 



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 



"Compare e. g. Oscar Hertwig: Die Zelle und die Gewebe. II. 

 P 23; Delage: L'Heredite etc. P. 114; G. Born: Uber Verwach- 

 sungsversuche mit Amphibienlarven. Leipzig, Engelmann. 1897. P. 

 I46ff. 



