12 BULLETIN 998, U. S. DEPARTMENT OF AGRICULTURE. 



Table 9. — Relation of color to composition of fruit. 



Determination. 



Eureka: 



Specific gravity 



Oil per ton of fruit (pounds). . 

 Acid per ton of fruit (pounds) 

 Lisbon: 



Specific gravity 



Oil per ton of fruit (pounds). . 

 Acid per ton of fruit (pounds) 



Dark 

 green. 



0.950 

 9.1 

 62.0 



.921 

 11.3 

 59.0 



Light 

 green. 



0.939 

 9.2 

 66.0 



.922 

 9.8 

 62.0 



Light 

 yellow. 



0.926 

 9.6 

 66.0 



.912 

 10.0 

 66.0 



Full yel- 

 low. 



0.929 

 11.0 

 69.0 



.918 

 10.5 

 73.0 



Table 10. — Correlation between thickness of -peel and composition of fruit. 



Determination. 



Eureka: 



Specific gravity 



Oil per ton of fruit (pounds) . . 

 Acid per ton of fruit (pounds) 

 Lisbon: 



Specific gravity 



Oil per ton of fruit (pounds) . . 

 Acid per ton of fruit (pounds) 



Composition. 



Thick skin. 



0.924 

 8.4 

 59.0 



.913 

 10.3 

 60.0 



Medium 

 skin. 



0. 936 

 9.9 

 67.0 



.920 

 10.0 

 65.0 



Thin skin. 



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. 



Snecine 

 gravity 

 of fruit. 



Oil per ton 



of fruit. 



Acid per 

 ton of 

 fruit. 



Coastal: 



0.962 

 .943 

 .940 

 .923 



.927 



Pounds. 

 9.9 

 10.0 

 8.6 

 9.6 

 7.8 



Pounds. 

 74.3 





61.4 



Do 



63.9 



Do 



62.1 





47.2 









.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 





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 0.933 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 



