C. A. BARBER 



167 



selected, at random, that between leaf width and sucrose in Karun seedlings, 

 and I have gone into this in some detail in order to indicate some of the diffi- 

 culties encountered in the work. Arranging the whole 322 Karun seedlings 

 in order of leaf width, it was found that they fell into 20 classes differing from 

 one another by one-tenth of an inch, and ranging in width between To" and 

 3'6." The best sucrose reading obtained in petty or bulk analysis was placed 

 opposite each seedling and averages were struck for each class of common 

 leaf width. The following was thus obtained : - 



Leaf widlh and sucrose in Karun seedlings. 



The figures in column 2 of the table present together a fairly normal 

 frequency curve {ef. p. 142), and it may be noted that in column 4 the higher 

 sucrose values are more or less collected in the upper half of the table. But 

 the importance of these values in the general average is regulated by the number 



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