TRANSPLANTATION AND INDIVIDUALITY. 151 



is a prolonged latent period in the case of syngenesiotransplanta- 

 tion and the vascular and connective tissue reaction falls into this 

 latent period. 



As we have stated above we find in syngenesiotransplantation 

 all degrees of intermediate condition in different individuals of 

 the same family, for instance in different brothers. In some indi- 

 viduals host and graft may be almost as unsuitable to each other 

 as after homoiotransplantation. In such a case the metabolic 

 alteration of the transplant may have reached a considerable 

 strength at the period, when the vascular and connective tissue 

 reaction is determined. In this case the dense fibrous tissue of 

 homoiotransplantation may be produced in syngenesiotransplan- 

 tation. 



Most beneficial seems to be the exchange of tissues between 

 brothers and sisters. Very good, but perhaps sligthly less advan- 

 tageous is the transplantation from parents to children. Pecul- 

 iarly enough, we found that after transplantation of the thyroid 

 in the guinea pig from child to mother the result is about as un- 

 favorable as after transplantation into a totally strange individual 

 of the same species. This peculiar phenomenon we intend to 

 analyze still further. A similar intermediate condition we found 

 after multiple simultaneous transplantation of organs into rela- 

 tives in the rat. In this case we have, of course, to take into con- 

 sideration the fact that different organs and parts of organs differ 

 in their power of resistance in the period following transplanta- 

 tion, and that the relation between the parenchyma and stroma 

 also differ in different organs. Again we found in the latter 

 series all degrees of intermediate condition and different organs 

 behaved in the same host in an analogous way, if they, came from 

 the same donor. 



TRANSPLANTATION OF UTERUS. 



In the transplantation of the uterus, we are especially interested 

 in the behavior of the myxoid or predeciduomatous, cellular con- 

 nective tissue and in the unstriated muscle tissue which are char- 

 acteristic of the uterine structure. Soon after transplantation the 

 death of a part of the myxoid connective tissue, which is not un- 

 like connective tissue present in the embryo, and of the unstriated 



