TiiK Yuma Mi:s.\ 2S.^ 



sentative samples of the leadings varieties now growings in this dis- 

 trict were closely studied and compared with similar varieties of 

 other commercial citrus growing regions — particularly California 

 and Florida. Table XIII is a summary of the physical analyses of 

 Yuma fruits. 



For comparison with the fruit of the older citrus regions the 

 physical analysis of the California Washington Navel, as given in 

 the California Experiment Station report of 1902, is given in Table 

 XIV. The figures represent the average of a number of samples 

 collected from the leading citrus districts of California. They were 

 taken during the latter part of November — one or two weeks later 

 than the Yuma Mesa samples. 



It will be observed that in percentages of rind and juice con- 

 tent, the Yuma Navels are superior at this season to the California 

 Navels. 



Table XV gives the composition of the fruit on the Yuma 

 Mesa as relates to sugar and acid content. This analysis represents 

 the average of two determinations; samples taken November 15. 



FAULK X\" CHEMICAL COMPOSITION OF YUMA MESA CITRUS FRUITS 



Total Apparent Citric Cane Invert Total 



Variety weight sugar acid sugar sugar sugars 



Decrees 



■ ■ : >:< '/, % 



Washington Navel 



orange 337.2 12.22 .57 5.99 4.16 10.15 



Valencia orange.... 187.1 11.88 1.12 4.22 4.38 8.60 



Mediterranean 



Sweet orange 143.6 12.02 1.88 3.75 3.66 7.41 



Marsh Seedless 



grapefruit 323.4 11.34 2.00 3.68 4.18 7.86 



Eureka lemon 147.3 10.17 7.04 



Lisbon lemon 143.8 10.19 7.05 



This analysis shows that the Washington Navel variety of 

 orange has attained by the middle of November a degree of ripe- 

 ness or of total sugar content of 10.15 percent, which, according 

 to Wickson, is .16 percent in excess of a fully ripe Southern 

 California Navel and exceeds by 2.70 percent the Navel as produced 

 m Florida. The percentage of citric acid in fully ripe Southern 

 California Navels, as given by Wickson, is 1.45 i)ercent and that 

 of Florida Navels .95 percent, whereas, the samples from the Yuma 

 Mesa orchard show only .57 percent. This low acid content, to- 

 gether with the high sugar content, establishes a record for sweet- 

 ness in the Navel variety of orange that is unsurpassed. The 

 V alencia, Mediterranean Sweet, and Marsh Seedless are not ex- 



