Abscission of Flowers and Fruits of the Apple 



73 



TABLE 27. Relation between Diameter of Conducting Tissue and Weight 



OF Spur 



Relative diameter of conducting tissue 



Small (1-1.5 mm.). . 

 Medium (1.6-2 mm.) 

 Large (2.1-2.5 mm.) . 



Number 



of 



spurs 



74 

 112 



39 



Total 

 weight 

 (grams) 



110.7 

 276.4 



127-45 



Average 

 weight 

 (grams) 



1.50 

 2.47 

 3 27 



RELATION BETWEEN DIAMETER OF CONDUCTING TISSUE AND WEIGHT OF 



SPURS, FROM LIMBS HAVING A LIGHT BLOOM AND FROM 



THOSE HAVING A FULL BLOOM 



As previously shown, the percentage of fruit set on limbs with rela- 

 tively few flower-bearing spurs is greater than on limbs with an abundant 

 bloom. It has been seen that heavy spurs have a greater tendency to 

 set fruit than weak spurs, and that there is a relation between the weight 

 of the spur and the diameter of the conducting cylinder in the spur. Are 

 the spurs on limbs with a light bloom, heavier and more vigorous than 

 the spurs on limbs with a full bloom? If so, is the conducting tissue of 

 greater diameter in the former spurs than in the latter? These questions 

 are answered by the data in table 28. Lot i consisted of all flower -bearing 

 spurs from a limb on a Baldwin tree, and lot 2 of spurs from limbs on 

 an Autumn Strawberry tree. Only twenty-five spurs from the limbs with 

 a full bloom, and twenty-five from the ones with a light bloom, were 

 considered in the latter case.' 



TABLE 28. Relation between Diameter of Conducting Tissue and Weight 

 of Spurs, from Limbs Having a Light Bloom and from Those Having 

 a Heavy Bloom 



187 



