one must experiment to some extent in order to find out what 
plants will and what will not successfully unite through grafting. 
Of course, one is practically assured of success if one grafts only 
parts of a plant with other parts of the same plant, or even with 
its seedlings, but obviously such grafting would be of little prac- 
tical value. Plants which cross, whether that signifies close 
genealogical relationship or not, usually form, when brought 
together as scion and stock, a fair graft union. However, if 
plants do not cross, there is still a possibility of successfully 
grafting or budding them, as the examples previously mentioned 
demonstrate. 
Figure 5 is an illustration of such successful grafting between 
forms which have never been successfully crossed. Tomato, 
tobacco and the potato, according to some of our systematic 
friends, each belong to a separate genus of the same family, but 
there is no trouble about successfully grafting them with one 
another, as the plants from which the photographs were made 
(now in the greenhouse of the Brooklyn Botanic Garden) indis- 
putably demonstrate. Strange, isn’t it, that a potato and tomato 
can grow on a tobacco plant, get their nourishment through its 
roots, and never show a sign of such association in their external 
character or in the taste of their “fruits”! 
O. E. W. 
