76 
BULLETIN" 813, U. S. DEPARTMENT OF AGRICULTURE. 
Table XYII gives the .average weight per fruit of lemons of the 
Green and Tree-Ripe grades produced by the trees of the various 
strains of the Eureka variety during the 6-year period. The data for 
the two grades combined is shown graphically in figure 15. Many of 
the fruits of the 
Tree-Ripe grade are 
picked before they 
reach the size at 
which the Green- 
grade fruits are 
picked: hence, their 
average weight is 
less than that of the 
Green-grade fruits. 
Throughout the 
progress of these 
studies the fruits of 
the Pear-Shape 
strain have been 
recognized as de- 
cidedly slow growing, especially in view of the light production of 
the trees of that strain. The trees of the Dense-Unproductive and 
the Shade-Tree strains are not only low producers, but are also very 
vigorous growing, and their fruits are shown to be above the average 
of the other strains in weight, as would be expected. 
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Fig. 15.— Diagram showing the average weight per fruit of the Green 
and Tre e-Ripe grades from the trees of the various strains of Eureka 
lemons occurring in the investigational performance-record plat 
for the 6-year period from July, 1911, to June, 1917, inclusive. 
Table XVII. — Average iveight per fruit for lemons of the 'Green and Tree-Ripe grades 
produced by the trees of the various strains of the Eureka variety in the investigational 
-performance-record plat during the 6-year period from July, 1911, to June, 1917 .inclusive. 
Num- 
ber 
of 
trees. 
Description of trees. 
Average weight per fruit 
(ounces). 
Green 
grade. 
Tree-Ripe 
grade. 
Both 
grades. 
2 
76 
10 
117 
10 
2 
10 
10 
17 
Pear-Shape strain 
Eureka strain 
Small-Open strain 
Entire plat 
Highest producing (all Eureka strain). . . 
Dense-Productive strain 
Lowest producing (irrespective of strain) 
Dense- Unproductive strain 
Shade-Tree strain 
4.270 
4.273 
4.275 
4. 295 
4.280 
4.318 
4.377 
4.411 
4.391 
3.194 
3.476 
3.513 
3.483 
3.490 
3.470 
3.546 
3.575 
3.624 
3.790 
4.012 
4.048 
4.050 
4.059 
4.113 
4.214 
4.244 
4.271 
Figure 16 illustrates graphically the variations in the average seed 
content of the fruits from the lemon trees of the different strains of 
the Eureka variety in the investigational plat. It is shown that the 
fruits of the Eureka strain contain on the average 7.1 seeds per 
fruit, which is more than was found in the fruits of any other strain. 
The fruits from the undesirable Shade-Tree and Dense-Unproductive 
