308 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION 



SUGAR CONTENTS 



The unfrozen oranges in storage show a variation in the amount 

 of sugar present, but show no progressive changes, thus indicating 

 that the variation is probably due to the difference in individual 

 samples taken for analysis. The average of the unfrozen lots in 

 storage was 9.06 per cent and the frozen 7.42 per cent throughout 

 the experiment. The average percentage of sugar for the fruit picked 

 at different dates was very close to that of the stored fruits, the 

 difference being within the limits of experimental error. The per- 

 centage of sugar in the juice of the lemons shows the same kind of 

 variation as was the case with the oranges (see table 8). 



The great change which has been taking place in the fruit is more 

 clearly illustrated when we consider the actual amount of sugar present 

 in the individual fruits (table 9). While the figures for the total 



TABLE 9. Grams of Sugar per Fruit. 



NAVEL ORANGES EUREKA LEMONS 



Stored lots (a) Different picks (b) 



Unfrozen Frozen Unfrozen Frozen 



1.3 1.3 



1.0 0.7 0.8 0.9 



1.2 0.4 1.1 0.5 



0.8 0.3 1.2 0.4 



1.0 0.2 1.3 0.3 



1.0 0.2 0.9 0.1 



0.8 1.0 0.08 



1.2 0.08 



1.0 1.2 0.2 



0.9 0.08 



0.9 



amount of sugar given in grams per fruit is admittedly not exact, 

 because of the difficulty of extracting all of the juice, yet, in view of 

 the fact that the same size oranges, 150's, and lemons of standard ring 

 size were used in all cases, it permits a basis of comparison that is 

 more striking than the percentage composition. It is more important 

 to know, for example, that on February 23rd the sound orange con- 

 tained 8.8 grams of sugar, while the frozen one contained 2 grams, 

 than it is that the percentage of sugar in the first lot was 9 per cent 

 and in the second was 8.03 per cent. When we consider the average 



