io8 Bulletin 393 



20. Spurs arising from buds that are terminal on a spur growth of 

 more than one centimeter have a greater average weight than spurs 

 from buds borne at the end of a shorter growth. 



21. The cyHnders of conducting tissue have a greater diameter in 

 the heavy spurs than in the light spurs. 



22. The average weight of spurs on limbs that produce few flower- 

 bearing spurs is greater than for spurs produced on limbs with a full 

 bloom. Spurs with a given diameter on the former limbs weigh more 

 than spurs with the same diameter from the limbs with a full bloom. 



23. The water supply is a factor in increasing the size of leaves. More 

 water passes to vigorous buds than to weak buds. 



24. Frequently the spurs that set fruit make a vigorous lateral growth. 

 Limbs that set fruit on a high proportion of spurs often produce the 

 largest amount of lateral growth from flower-bearing spurs. 



25. Limbs receiving a diminished supply of sap produce fewer fruits 

 to a hundred spurs than limbs receiving a normal or an excessive supply 

 of sap. The small spurs as well as the large ones are benefited by an 

 increased amount of sap. 



26. Vigorous spurs from which all the leaves are removed before the 

 flower buds open are not so fruitful as similar spurs that are not defoliated. 

 Vigorous spurs that have all but two leaves removed, set approximately 

 as well as normal spurs, which usually have from seven to ten bud leaves. 

 The proportion of spurs setting more than one fruit is three times as 

 great in the case of the check spurs as in the defoliated lot. 



27. Spurs inclosed in white translucent sacks are more fruitful than 

 those inclosed in brawn opaque sacks. 



28. The apples that fall in the early stages of their development have 

 fewer seeds, on the average, than the apples that remain on the tree; but 

 many fruits remaining on the tree have few seeds, and many fruits that 

 drop have a high seed content. 



29. In general, the weight of the fruit is proportional to the number 

 of seeds in the fruit. The vigor of the spur on which the fruit is borne, 

 and the size of the embryos in the seeds contained in the apple, also play 

 a part in determining the weight of the fruit. The term seed value 

 emphasizes the quality of the seeds. This quality is manifested by the 

 ability of the individual seeds to increase the weight of the fruit, and it is 

 associated with the size of the embryo contained in the seed. The quality 

 may be the result of cross-fertilization. 



30. Spurs bearing fruit with a low seed value are heavier on the average 

 than spurs produced on the same limb but bearing fruits with a high 

 seed value. 



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