140 BULLETIN 623, U. S. DEPARTMENT OF AGRICULTURE. 
the thickness of the rind are of importance in determining the weight 
of the individual fruits. This condition is illustrated by the low 
average weight of the Australian fruits in this diagram. These fruits 
usually have very thick rinds and a comparatively small quantity 
of juice. Therefore, although they are usually as large as the fruits 
of the other strains, they are lighter in weight and inferior in quality. 
Other less important contrasting characteristics of the various 
strains of the Washington Navel orange have been studied in the 
course of these investigations. All of these studies have added fur- 
ther evidence of the importance of these strains in their relation to 
commercial orange growing. All the data show that it is very im- 
portant to isolate the strains of this variety and, for commercial pur- 
poses, to propagate only the best of them. 
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Fig. 15. — Diagram showing the average weight per fruit for the total commercial crops of the trees of the 
various strains of the Washington Navel orange found in the investigational performance-record 
plats. These weights are expressed as decimal parts of a pound and are based on data for a 4-year period, 
1912 to 1915, inclusive. 
COMPARATIVE VALUE OF THE STRAINS. 
Any statement as to the comparative value of the various strains 
of the Washington Navel orange must be understood as applying 
only to present conditions. What the future of these strains may be 
under different cultural and market conditions no one can foretell. 
Under existing conditions, 2 of the 14 strains are valuable and 
3 others are of possible value to orange growers, while 9 are of little 
or no commercial value. In some cases the inferior strains are not 
only unproductive, but the poor fruits produced by them are actually 
detrimental to the general crop of the grove in which they occur, in 
that it is expensive and sometimes practically impossible to eliminate 
them during the packing process, and if some are left in the regular 
