THE TOMATO 177 



Growth continued, and the plants came to 

 maturity at about the expected season. 



But the results of the strange alliance were 

 interesting to the last degree. 



They must be considered in detail as having 

 a bearing on one of the most interesting open 

 problems of plant development the question of 

 sap hybridism. 



POTATOES GROWN ON TOMATO VINES 



The tomatoes that grew on the root stalks of 

 the potato developed much as other tomato vines 

 do, although in some cases it seemed that the 

 vines bore closer resemblance to potato vines 

 than is usual. But the fruit that appeared in 

 due season was a tomato differing in no very 

 obvious respect from other tomatoes of the same 

 variety. They, however, were not of as good 

 quality. 



Meantime the potato roots, which supplied 

 water and mineral salts to the tomato vine above 

 them, and which in turn must receive material 

 for the growing of their tubers from that vine, 

 showed quite unmistakably the influence of the 

 foreign system of leaves with which they were 

 associated. 



Instead of being smooth and symmetrical like 

 ordinary potatoes the tubers were small and ill- 



