FREEZING INJURY TO POTATOES WHEN UNDERCOOLED. 7 



Table III. — Freezing injury to seven varieties of potatoes held at 25° F. for 

 different lengths of time. 





Number of experiment and duration of exposure. 



Variety. 



No. 1, 5 hours. 



No. 2, 19 hours. 



No. 3, 24 hours. 



No. 4 ; 43 hours. 





Number 

 of speci- 

 mens. 



Number 

 injured. 



Number 

 of speci- 

 mens. 



Number 

 injured. 



Number 

 of speci- 

 mens. 



Number 

 injured. 



Number 

 of speci- 

 mens. 



Number 

 injured. 





2 

 2 

 2 

 2 

 2 

 2 

 2 





 

 

 

 

 

 



6 

 6 

 6 

 6 

 6 

 6 

 6 





 2 

 

 2 

 1 

 1 

 1 



11 

 11 

 11 

 11 

 11 

 11 

 11 



5 

 6 

 8 

 6 

 5 

 2 

 4 



3 



3 

 3 

 3 

 3 

 3 



»1 





02 



Spaulding No. 4 



1 





3 











63 





1 







Total 



14 







42 



7 



77 



36 



21 



11 







a Frozen solid. 



b Two were frozen solid. 



In Table III are shown the results obtained when the different 

 varieties were held at 25° F. In experiment No. 1 two specimens 

 of each variety were held 5 hours with no evidence of injury. In 

 exj)eriment No. 2 six specimens of each variety were stored 19 hours, 

 with injury to two Irish Cobblers, two American Giants, one Rural 

 New Yorker, one Russet Rural, and one Green Mountain. It is 

 worthy of note that the Triumph and Spaulding No. 4 varieties, 

 which according to Table I have a comparatively high freezing point, 

 did not show injury in this experiment. In experiment No. 3 eleven 

 specimens of each were held 24 hours, with serious consequences to 

 most of the varieties. Injury was found in five Triumphs, six Irish 

 Cobblers, eight Spaulding No. 4, six American Giants, five Rural New 

 Yorkers, two Russet Rurals, and four Green Mountains. The total 

 injury was 47 per cent. In experiment No. 4 three tubers of each 

 variety were held 43 hours, with injury to one Triumph, two Irish 

 Cobblers, one Spaulding No. 4, three American Giants, three Russet 

 Rurals, and one Green Mountain. Tubers of the Rural New Yorker 

 were not injured; one specimen of Triumph, one of Irish Cobbler, 

 and two of the Russet Rural varieties were frozen solid. The total 

 injury in this experiment Avas 52 per cent. 



Generally speaking, when potatoes of the seven varieties were held 

 for varying lengths of time at 28° or 25° F. they did not freeze in 

 any definite order or with relation to their freezing points. At 28° F. 

 the early-maturing varieties with the higher freezing points possibly 

 showed more freezing injury. 



INOCULATION OF UNDERCOOLED POTATOES. 



Attention is called to the fact that in the experiments just de- 

 scribed the potatoes were purposely held entirely undisturbed, as it 

 had been found that potatoes when undercooled are liable to freeze 



