26 



BULLETIN 813, U. S. DBPAKTMENT OF AGRICULTURE. 



duced by each tree is also expressed, being figured on tbe basis of the 

 weight of the crop. The proportion of variable fruits, by number, is 

 shown, as well as the average number of seeds per fruit. In the 

 performance data the number of split fruits have been recorded, as 

 have those showing brown-rot and sunburn, but such fruits are not 

 included in the class of variable fruits. In this table the trees are 

 ranked arbitrarily according to their average annual crops by weight, 

 without regard to the grade or quality of their fruit or its uniformity. 

 This basis of classification was adopted as the simplest and most 

 satisfactory one for this purpose, but its character is such that the 

 rank of the trees as listed does not necessarily give a true index of 

 their actual relative value. It would be impracticable to attempt to 

 rank all the trees of any large plat on such a basis, though it is usually 



//y^:>/i^fi:>i^^^ Tynfzv 



Fig. 9. — Diagram showing the average annual total crops and the production by the three commercial 

 grades from the individual trees in the investigational performance-record plat of Eureka lemons during 

 the 6-year period from July, 1911, to June, 1917, inclusive. 



quite possible to select the few of the most desirable individuals and 

 those most undesirable. It is interesting to note that of the 62 

 highest producing trees listed in this table all but three are of the 

 Eureka strain. 



In most cases where summaries are shown, the average or per- 

 centages are figured from totals for the period indicated, and not 

 from averages or percentages previously computed. 



A graphic representation of the variations in weight of the average 

 annual crops of all the trees in the Eureka lemon plat is presented 

 in figure 9. The trees are arranged from left to right in the order of 

 their rank, on the basis of their total crops as given in Table VI, and 

 the production of fruits of the Green,- Tree-Ripe, and Cull grades by 

 each tree is shown. 



