66 



BULLETIlSr 813, U. S. DEPAETMEISTT OF AGRICULTUKE. 



niaUy, each figure recorded in Table VIII "under this heading is the 

 average of three fruits, but in some instances it has been s soured 

 from one or two fruits. The total averages shown for each month, 

 those for each season, and those for the five years were obtained by 

 factoring the total number of seeds and the number of fruits exam- 

 ined ifor that purpose during the period indicated rather than by 

 averaging the monthly averages. 



The average number of seeds per fruit indicated by this method 

 varies considerably from the true average of all the fruits produced. 

 There is a considerable variation in seed content on the trees of 

 many of the strains between the fruit produced during different 

 months. Fruit production is much heavier in certain months than 

 during other months, while in the system of averaging here used, 

 which was the only practicable one under the circumstances, equal 

 weight is given to the seed data for each month. 





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Fig. 10.— Diagram showing the average annual total crops and the amounts of fruit of the different com' 

 mercial grades produced by the trees of the several strains of Eureka lemons occurring in the investiga- 

 tional performance-record plat during the 6-year period from July, 1911, to June, 1917, inclusive. The 

 strains are ranked according to the vreight of their average total crops. 



Table XI shows the average annual crops of the individual Eureka 

 lemon trees in the investigational performance-record plat, arranged 

 in groups of strains and of select trees within some of the strains. 

 The strains are listed in the order of their rank by total crops by 

 weight, and the production of fruit of the different grades is also 

 shown. These averages are shown graphically in figure 10. Several 

 of the strains are represented by different numbers of individuals, so 

 no exact comparisons can be drawn between them. However, as in 

 nearly every case the trees within each strain have shown a consid- 

 erable degree of imiformity with respect to their various character- 

 istics, the data shown in this and the following tables are thought 

 to be fairly indicative of the relative values of the different strains 

 represented. 



Table XI shows the trees of the Eureka strain to be more produc- 

 tive than those of any other in the list, with an average annual pro- 

 duction of 230 pounds for the 6-year period. Of the 76 Eureka trees 



