416 



EXPERIMENTS WITH PLANTS 



or less well -developed seed. Some of the seeds are 

 normal in size and shape, others more or less de- 

 formed and abortive, while in a certain percentage 

 seed and stone are both absent. Fig. 236 shows, 



. The Stoneless Plum, lowet row; and parents, upper row. At the right in the 

 lower row the Stoneless Plum, external appearance; in the middle the fruit cut open 

 showing a normal seed with a cavity where the stone would ordinarily be; at the 

 left, another fruit containing neither stone nor seed, the latter being represented 

 by a shriveled remnant. In the upper row the parents: at the right the French 

 Prune; at the left the Prunier sans Noyau. All natural size. 



in the middle of the lower row, one of these prunes 

 cut across; in this a well -developed seed is present: 

 on the left is shown another in which nothing remains 

 of the seed save an abortive remnant. While Mr, 

 Burbank believes it perfectly possible to breed out 



