Secondary C captation in Grafts 129 



point of their union. "This is an example of the phe- 

 nomenon observed also in all the other organs, that 

 after the growing together of two sections of unequal 

 size and form, the uneven character of the union, present 

 at first, disappears and gradually a smooth connection 

 of the surfaces is established." 96 



The union of the corresponding organs of the two 

 fragments is quite intimate: for example in the case 

 which we have just cited, longitudinal sections of the 

 two united medullas showed that the fibers of the white 

 substance of the medulla spinalis went over continuously 

 into those of the white substance of the elongated medulla 

 oblongata. 97 



Among the experiments of Born, those upon the 

 artificial production of double monsters are especially 

 remarkable. They were obtained by joining two tadpoles 

 together in the most diverse ways. In the case which 

 we now report he cut away from each of two tadpoles 

 the upper part of the ventricles of the brain and joined 

 the two cut surfaces together so that both the tails and 

 the bellies of the two tadpoles constituting the double 

 monster were directed in opposite ways. Here also, there 

 took place, in so far as the two tadpoles developed, a 

 complete union so that after sometime there could not 

 be perceived any transition stage between the surfaces of 

 the corresponding organs which were united together. 



"It is impossible to believe," remarks Born in this 

 connection, "that in placing these two tadpoles one upon 

 the other, the small ventricular clefts and the external 

 walls of the two brains could be applied exactly one upon 



*'G. Born : Uber Verwachsungsversuche mil Amphibienlarven. 

 P. 5354- 



B7 G. Born: Uber Verwachsungsversuche usw. P. 56. 



