316 



Harris M. Benedict 



each cutting. The cuttings produced mature leaves in time for study 

 during the summer. The average size of the vein islets in the leaves of 

 each of these fifty-four cuttings is shown in table 26, the number of rings 

 indicating the age in years of the vine from which the cuttings were made. 

 The cuttings themselves varied in diameter from 1.3 to 2.5 centimeters, 

 both small and large cuttings being taken from the older vines. The 

 size of the vein islets had no relation to the size of the cuttings. 



TABLE 26. Area of Vein Islets in Leaves from Cuttings Grown in Soil 





Number of rings 





5 to 15 



16 to 25 



26 to 40 





(Square 



(Square 



( Square 





millimeters) 



millimeters) 



millimeters) 





0.52 



0.37 



0.32 





0.50 



0.37 



0.33 





0.49 



0.35 



0.28 





0.41 



0.34 



0.30 





0.40 



0.35 



0.36 





0.36 



0.35 



0.38 





0.34 



0.30 



0.38 





0.36 



0.37 



0.34 





0.44 



0.34 



0.40 





0.40 



0.40 



0.32 





0.50 

 0.49 

 0.49 

 0.48 

 0.48 

 0.47 

 0.42 

 0.40 

 0.42 

 0.36 





0.35 







0.31 







0.23 







0.26 







0.26 







0.33 







0.33 







0.23 







0.23 







0.20 







0.23 









0.24 









0.23 









0.23 











Average 



0.44 



0.35 



0.29 



The relation between the size of vein islets in these cuttings and the 

 age of the original vines is graphically shown in curve A of figure 57. 



