Aug. i6, 1920 Ripening and Storage of Bartlett Pears 499 



increase in that from Oregon and Washington. There was an increase 

 in acid between the time of picking and the time of full ripening of the 

 fruit when held at 70° F. There was much less acid in fruit ripened at 

 40° than in that ripened at 70°, and still less in fruit that had been 

 held at 30°. The acid content of the fruit that was allowed to become 

 well matured on the tree remained nearly constant during storage, 



There was a progressive reduction in the alcohol-insoluble, acid-hydro- 

 lyzable reducing material as the season advanced, not only in the fruit 

 fresh picked from the tree, but also in the same fruit after ripening. 

 There is a marked reduction in these substances between the time when 

 the fruit is first picked and the time when the same fruit becomes ripe. 



The percentage of total solids is lowest at about the opening of the 

 commercial season. This tends to increase with the accumulation of 

 sugar in the late-picked lots. 



With proper precautions of picking, handling, and storing, Bartlett 

 pears can be held two to three months in storage and then taken out 

 in good condition. 



LITERATURE CITED 



(i) Clark, W. Blair. 



1917. A SAMPLING PRESS. In Jour. Indus, and Engin. Chem., v. 9, no. 8, p. 



788-790. 



(2) CruESS, W. v., and StoxE, P. M. 



I916. PRELIMINARY OBSERVATIONS ON THE RIPENING OF BARTLETT PEARS. 



In Mo. Bui. State Com. Hort. [Calif.], v. 5, no. 12, p. 425-429. 



(3) Dunbar, P. B.. and Bigelow, W. D. 



1913. THE ACID CONTENT oP FRUITS. (Abstract.) In Science, n. s. v. 38, no. 

 983, p. 639-640. 



(4) EWERT. 



1910. DIE KORRELATIVEN EINFLtJSSE DES KERNS BEIM REIFEPROZESS DER 



FRUCHTE. In Landw. Jahrb., Bd. 39, Heft 3, p. 471-486, pi. 12-13. 



(5) Gore, H. C. 



1911. STUDIES ON FRUIT RESPIRATION. U. S. Dept. Agr. Bur. Chem. Bui. 142, 



40 p., 17 fig. 



(6) Kelhofer. 



1899. WEITERE UNTERSUCHUNGEN tJBER DIE VERTEILUNG VON ZUCKER, SAURE 

 UND GERBSTOFF IN DEN BIRNENFRUCHTEN. In VI. & VII. Jahresb. 



Deut. Schweiz. Vers. Sta. u. Scliule Obst-, Wein- u. Gartenbau 

 Wadensweil, 1895/96-1896/97, p. 68-71. 



(7) KULISCH, P. 



1892. BEITRAGE ZUR KENNTNISS DER CHEMISCHEN ZUSAMMENSETZUNG DER 

 AEPFEL UND BIRNEN MIT BESONDERER BERUCKSICHTIGUNG HIRER 



VERWENDUNG ZUR obstweinberEitung. In Laiidw. Jahrb., Bd. 21, 

 p. 427-444. 



(8) Lewis, C. I., Macness, J. R., and Cate, C. C. 



1918. preliminary report OF PEAR HARVESTING INVESTIGATIONS IN ROGUE 



RIVER VALLEY. Oreg. Agr. Exp.' Sta. Bui. 154, 24 p. 



(9) MuRNEEK, A. E., and Gate, C. C. 



1919. pear HARVESTING AND STORAGE INVESTIGATIONS IN ROGUE RIVER 



VALLEY. (Second report.) Oreg. Agr. Exp. Sta. Bui. 162, 39 p., 

 10 fig. 



