COMPOSITION OF CALIFORNIA LEMONS. 



15 



Figure 2 4 shows the specific gravity of the fruit in both varieties 

 as harvested monthly. The monthly average shown here must not 

 be interpreted, too literally, for usually the differences from month to 

 month are small. A general trend is shown, however, and there is 

 little doubt that the changes from season to season are really signifi- 

 cant. For the first four months of the year, the Eurekas change but 

 little, while there is a gradual increase in the specific gravity of the 

 Lisbons. With the advent of spring, the Eurekas begin to increase 

 rapidly, and this increase continues without interruption until mid- 

 summer. During the corresponding period, the Lisbons also increase 

 rapidly, reaching the maximum in August. From midsummer to 

 January there is a marked decline in the specific gravity of both 





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Fig. 2. — Monthly averages of specific gravity. 



varieties. The data leave no doubt that both varieties have the 

 lowest specific gravity during the winter months and the highest in 

 midsummer. 



Figure 3 shows the variation in the oil content of the fruit har- 

 vested each month of the year. Here again indisputable differ- 

 ences occur in both varieties, and the general trend of both is very 

 much the same. The late winter and spring fruit contains a mini- 

 mum amount of oil. The oil content is only slightly increased in 

 the summer fruit, but with the advent of fall it rises rapidly, until 

 December finds the oil content at a maximum in both varieties. 



* In determining the monthly averages, where there are several monthly samples from one tree, the 

 average is taken. Where monthly samples are missing, the results are interpolated, the average of the 

 preceding and succeeding months being used. 



