.VAKf.YG .VA'H' KiyiiS OF PLANTS 



411 



of this point; it is a cross betweeu the Freiii;h Prune 

 (shown in Fig. L'o(j) and the Pond Plum (a Euroijean 

 Plum about one and three-quarter inches in length), 



231. luereaseJ bize in I'lums due to hybridization ' williout seleetion\ Japanese 

 parent on tlie left, American on the right, hybrid in the center. Two-thirds 

 natural size. 



and was brought to its present huge size by con- 

 tinued selection: it therefore owes its size to crossing 

 plus selection. Another offspring of the French 

 Prune, called the Sugar Prune (Fig. 'lo'l) , is not 

 only much larger but ripens a month earlier and 

 is even sweeter than the parent, running as high as 

 about 24 per cent sugar, or f)i'i''tical]y one-fourth 

 of the total weight of the fresh fruit. This was 

 obtained simply by selection, no crossing having 

 been done. Tliese three 

 instances illustrate very 

 well the different ways of 

 securing increased size. 



, .p. -, . . 2:jJ. Infreased size in Plums due entirely lo 



O. rJy producing vane- selection (without crrcj-^ing). French Pmne 



, . , . ,-, (dried) on the left; Sugar Prune (dried) on 



ties which ripen a mOntn the nght. two thirds natural size. 



