272 



ELEMENTARY BIOLOGY 



determines what kind of fruit will grow from a twig, rather 

 than the character of the food that is supplied. 



324. Grafting in animals. Grafting is possible in all classes 

 of animals, but in a very unequal degree. In the insects, 



Fig. no. Grafts 



A bud or twig of one plant is made to grow by means of nourishment supplied by the 

 root or stem of another plant. The root or stem supplying the nourishment is called the 

 stock ; the bud or twig grafted on the stock is called the scion. The figure shows stem, 



bud, and root grafts 



experimental grafts have been produced with two halves from 

 different individuals. The most interesting grafts, from a 

 practical point of view, are the fairly common skin grafts. 

 More far-reaching are the experiments of recent years, in which 



