12 BULLETIN 993, U. S. DEPARTMENT OE AGRICULTURE. 
Table 9. — Relation of color to composition of fruit. 
Determination. 
Dark 
green. 
Light 
green. 
Light 
yellow. 
Full yel- 
low. 
Eureka: 
Specific gravity 
Oil per ton of fruit (pounds). . 
Acid per ton of fruit (pounds) 
Lisbon: 
Specific .gravity 
Oil per ton of frait (pounds).. 
Acid per ton of frait (pounds) 
0.950 
9.1 
62.0 
.921 
11.3 
59.0 
0.939 
9.2 
66.0 
.922 
9.8 
62.0 
0.926 
9.6 
66.0 
.912 
10.0 
66.0 
0.929 
11.0 
.918 
10.5 
73.0 
Table 10. — Correlation betiveen thickness of peel and composition of fruit. 
Determination. 
Composition. 
Thick skin. 
Medium 
skin. 
Thin skin. 
Eureka: 
Specific gravity 
Oil per ton of fruit (pounds) . . 
Acid per ton of fruit (pounds) 
Lisbon: 
Specific gravity 
Oil per ton of frait (pounds) . . 
Acid per ton of frait (pounds) 
0.924 
8.4 
59.0 
.913 
10.3 
60.0 
0.936 
9.9 
67.0 
.920 
10.0 
65.0 
0.958 
9.6 
72.0 
.920 
11.2 
75.0 
Table 11. — Comparison of composition of coastal with that of inland Eureka lemons. 
Location. 
Specific 
gravity 
of fruit. 
O il per ton 
of frait. 
Acid per 
ton of 
frait. 
Coastal: 
0.962 
.943 
.940 
.923 
.927 
Pounds. 
9.9 
10.0 
8.6 
9.6 
7.8 
Pounds. 
74.3 
Whittier. 
61.4 
Do 
63.9 
Do 
62.1 
47.2 
Average 
.939 
.942 
9.2 
9.5 
61.8 
65.3 
Inland: 
.939 
.941 
.941 
.938 
.940 
9.2 
8.9 
11.3 
10.2 
9.8 
73.3 
Do 
69.1 
S?n Fernando 
66.6 
65. 2 
61.4 
. 940 9. 7 
67.1 
DISCUSSION OF RESULTS. 
DIFFERENCES IN VARIETIES. 
The average composition of the Eureka, Lisbon, and Villa Franca 
varieties is shown in Table 6. The figures below the averages are 
the probable errors of the . mean. For instance, under specific 
gravity the figure 0.938 is the average obtained from more than 
100 samples. Had the specific gravity of each sample been 0.938, 
there would be no doubt that that figure represented the true aver- 
age of the lot. This was not the case, however, and never is, where 
