THE ORGANS OF REPRODUCTION 99 



grafting of a new tissue to take the place of the 

 old. This held out hope, for many experiments 

 with glands of the ductless variety pointed to the 

 fact that they could be removed from their original 

 positions in the body and grafted on to some distant 

 tissue of the body, with no ill-effects, provided the 

 graft "took" ; that is, provided a healing condition 

 set in whereby the blood vessels of the gland and 

 those of the rest of the body would connect up, so 

 as to allow the hormone of the ductless gland to 

 enter the general circulation. 



Upon ideas such as these are based the much- 

 talked-of experiments of a Steinach and a Voronoff. 

 "The grafting of a young sex gland in full activity," 

 writes Dr. Voronoff, "means incorporating in the 

 organism the very source of our organic action. 

 Thus the body would be supplied not with a dead 

 product, incomplete, often changed, introduced 

 from time to time by means of subcutaneous injec- 

 tions, but a living organ carrying out its functions 

 itself. To graft this gland is to place it in direct 

 communication with our blood vessels, which will 

 undertake to transport the precious fluid in pro- 

 portion to its formation in the intimacy of our 

 tissues." 



Before we proceed to these experiments a word 

 must be said as to the methods used in the trans- 

 planation of tissues. There are two ways of doing 

 this: either by merely inserting a small strip of 



