. Citrus fruits; an account of the citrus fruit industry, with special reference to California requirements and practices and similar conditions . ons carriedon in the U. S. D. A. Bureau of Chemistry in 1905. During the storage (of Navel oranges) there was a slight lossin acid and in sugar. This is confirmatory of similar results 288 Citrus Fruits Navel oranges color earlier and become sweet earlierin central than in sonthern or northern California. Theapparent advantage in sweetness ofearly oranges from southern SanJoaquin Valley is not due so muchto an early increase in total sugars asit is
. Citrus fruits; an account of the citrus fruit industry, with special reference to California requirements and practices and similar conditions . ons carriedon in the U. S. D. A. Bureau of Chemistry in 1905. During the storage (of Navel oranges) there was a slight lossin acid and in sugar. This is confirmatory of similar results 288 Citrus Fruits Navel oranges color earlier and become sweet earlierin central than in sonthern or northern California. Theapparent advantage in sweetness ofearly oranges from southern SanJoaquin Valley is not due so muchto an early increase in total sugars asit is to an early increase in the ratiobetween sugar and acid. Colby ^ hasshown that it is the early decreasein acid, together with the early color-ing, which enables the growers in theSan Joaquin \alley to market theiroranges early. Recently C. L. Alsberg, chief ofthe Bureau of Chemistry, U. S. , suggested that as a result of in-vestigations carried on, the northerndistrict oranges may be considered to be immature when thejuice does not contain soluble solids equal to or in excess ofeight parts to each part of acid present, acid to be calcu-. FiG. 106.—Citrus fruittruck. with apples and peaches, and is probably due to the decomposi-tion of acid and sugar in the respiration of the fruit. . Theloss of acid and sugar noted above is to be explained, as in thecase of apples, by the consumption of these substances as aresult of respiration of the fruit. — W. D. Bigelow and H. , Ripening of Oranges. Read before A. A. A. S. inNew Orleans, 1905. Contribution from the Bureau of Chemistry,U. S. Dept. Agr. — Published in Journal American ChemicalSociety, Vol. 29, No. 5, 1907. ^ G. E. Colby, Comparative Examination of Shipping NavelOranges from Northern, Middle, and Southern California,California Agr. Exp. Sta. RpL, 1898-1901, Part II, pp. 243-251. Picking and Packing Oranges 289 lated as citric without water of crystallization. It wasdecided to base this figure upon the acid sol
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