8 



BULLETIN 35, U. S. DEPARTMENT OF AGRICULTURE. 



The dates given in this table are not absolute; they are approxi- 

 mate averages made from many observations during three or four 

 seasons and are meant to indicate the behavior of the different vari- 

 eties in cold storage when handled with sufficient care to insure their 

 being packed in sound condition. There is always wide variation 

 between different seasons and frequently between different packages 

 during the same season. This diversity is likely to be more pro- 

 nounced when the fruit is packed under ordinary commercial con- 

 ditions than is the case when the handling is done with extreme care 

 under experimental conditions. 



MOST FAVORABLE TEMPERATURE FOR GRAPE STORAGE. 



Grapes used in the experimental storage tests were held in common 

 storage at temperatures ranging from 55° to 60° F. and in cold stor- 

 age at 38° and 32° F. Tables VI and VII give the results of the 

 storage temperature tests, the data being presented in terms of the 

 number of days elapsing before 5 per cent, 10 per cent, and 15 per 

 cent of total deterioration developed. Comparable experimental 

 series were used each season and the figures presented give a fair 

 indication of the influence of the storage temperature upon the length 

 of time that the grapes will remain in good condition. Table VI 

 clearly shows the limitations of common storage as compared with 

 cold storage at 32° F., for under the latter conditions nearly four 

 times as many days elapsed before the development of 5 per cent of 

 deterioration, while the 10 per cent period was not reached until three 

 times as many days had passed, and the 15 per cent period almost 

 three times as many. 



Table VI. — Comparison of storage temperatures for table grapes showing the 

 number of days the grapes were held in common storage (from 55° to 60° F.) 

 and cold storage (32° F.) before 5 per cent, 10 per cent, and 15 per cent of 

 deterioration appeared during the season of 190S. 





Packing. 



Kind of storage and percentage of deterioration. 



Variety. 



Common storage 

 (55° to 60° F.). 



Cold storage 

 (32° J\). 





5 



per 

 cent. 



10 



per 

 cent. 



15 

 per 

 cent. 



5 



per 

 cent. 



10 

 per 

 cent. 



15 

 per 

 cent. 





Cork, granulated 



Days. 

 33 

 40 

 40 

 21 

 10 

 26 

 14 

 23 

 12 

 12 

 15 

 17 

 10 

 15 

 15 

 17 



Days. 

 43 

 55 

 62 

 29 

 18 

 34 

 43 

 30 

 19 

 19 

 19 

 21 

 17 

 21 

 31 

 28 



Days. 

 50 

 64 

 72 

 34 

 25 

 39 

 46 

 35 

 24 

 24 

 21 

 25 

 21 

 25 

 45 

 35 



Days. 

 105 

 118 

 157 



55 

 65 



05 

 75 

 63 

 72 

 57 

 42 

 77 

 29 

 68 

 78 

 45 



Days. 

 119 

 135 

 190 

 69 

 75 

 74 

 94 

 69 

 84 

 64 

 52 

 87 

 41 

 84 

 92 

 68 



Days. 

 128 



Do 



Cork, shredded 



146 



Do 





212 



Emperor 





77 



do 



82 



Do . 





80 



Do 





105 







75 



Do 





91 







70 



Do 



Cork, fine granulated 



do 



58 



Do 



96 



Do 





48 



Verdal . 





93 



Do 





102 



Do 





83 









