BUD VARIATION IN THE WASHINGTON NAVEL ORANGE. 139 
fruit, as compared with only 53 per cent of the most desirable sizes 
and 68 per cent of first-grade fruit produced by the low-yielding trees. 
The production of variable fruits by trees of some of the important 
strains is shown graphically in figure 14. The low production of 
these inferior fruits by trees of the Washington strain, amounting to 
0.66 per cent, as compared with the large production of such fruits 
borne by the Thomson, Golden Nugget, Sporting Thomson, Sporting 
Washington, and Wrinkled Australian strains, shows the superior 
quality of the Washington strain in this respect. The comparative 
freedom from variable fruits of many trees of the Washington strain 
and other characteristics of these trees indicate the possibility of 
controlling the amount of bud variability in commercial orchards by 
bud selection based on performance records, In counting the vari- 
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Fig. 14.— Diagram showing the average percentage of variable fruits found on the trees of the different 
strains of the Washington Navel orange in the investigational performance-record plats during a 4-year 
period, 1912 to 1915, inclusive. The proportions are based on the total number of fruits produced. 
able fruits on a tree, only those showing some marked variation 
from the general type of the fruits produced by that tree have been 
recorded; for instance, in the case of trees of the Yellow strain, only 
those fruits showing some marked variation from the Yellow strain 
have been listed as variable fruits. On the Sporting Washington 
and Thomson trees all fruits other than those typical of the Wash- 
ington or Thomson strains have been listed as variable fruits. In 
trees of the Wrinkled Australian strain the fruits do not all show the 
characteristic coarse or wrinkled appearance, so that on these trees 
all fruits other than those of the Washington strain have been counted 
as variable fruits. 
In figure 15 is shown the average weight per fruit of the total com- 
mercial crops of all the trees of the different strains in the performance- 
record plats. Aside from the factor of size, the amount of juice and 
