Abscission of Flowers and Fruits of the Apple 



99 



the presence or absence of seeds in one cavity of the fruit makes relatively 

 little difference in the growth of the corresponding side of the apple 



Fig. 7. CROSS sections of apples that dropped and of those that remained 



ON the tree 



The circles surrounding each section are drawn with the longest possible radius extending from the 

 center of the core to the surface. The smaller apples are the June drops. In these the fruits fall behind in 

 their development on the seedless side. In the apples remaining on the tree (the larger sections) asymmetry 

 is not so closely correlated with the seedless cavity 



(fig. 7). Fruits remaining on weak spurs after the June drop are nor- 

 mally well pollinated and generally develop seeds in all cavities; hence 

 they too will be symmetrical. 



RELATIONS TO BE CONSIDERED IN CHOOSING FRUITS BORNE UNDER SIMILAR 



CONDITIONS 



As pointed out previously, it is very essential that fruits intended 

 for study of the relations between size of fruit, number of seeds, and 

 vigor of spur should be produced under exactly similar conditions. 

 The following paragraphs suggest some of the things which must be kept 

 in mind in choosing fruits suitable for this purpose. 



213 



