GRAFTING 



421 



the organism was killed for examination, and fell apart 

 in two pieces evidently the primary union was tempo- 

 rary, and being unsuccessful was followed by regeneration. 

 In Joest's experiments with earth-worms it was found 

 to be difficult, though possible to successfully unite 

 Lumbricus rubellus and Allolobophora terrestris so 

 that a single individual was produced that lived for 



FIG. 148. The upper figure shows two tadpoles of Rana esculenta conjoined 

 by the dorso-cephalic surfaces. 



In the lower series A shows Rana esculenta and Rana arvalis successfully 

 grafted upon one another; B, Bombinator igneus and Rana esculenta success- 

 fully grafted, and C, the anterior half of Rana esculenta successfully engrafted 

 upon the posterior half of Rana arvalis. (Redrawn from Born.) 



eight months. Each piece is said to have retained its 

 specific characteristics without modification. 



Born, in his experiments upon tadpoles, found it 

 possible to unite parts of animals of different species, 

 and even of different genera; thus in one experiment he 

 was successful in securing a union comprising an anterior 

 half of Rana esculenta with the posterior half of Bombi- 



