26 
BULLETIN 813, U. S. DEPARTMENT OF AGRICULTURE. 
duced by each tree is also expressed, being figured on the 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 
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Tig. 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 sum m aries 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. 
