FROST INJURY TO TOMATOES. 





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irOOAM lOOAM ZMdM JOOAM 4[l9Afll HOAM 



Fig. 1. — Hourly temperature measurements taken at Bell, Md., on the night of the first 

 frost of the autumn of 1919. Thermometers were placed at ground level and at eleva- 

 tions of 6 and 18 inches ; also at the surface and centers of three tomatoes on the vine 

 at about 12 inches elevation. 



side temperature at 30.2° and falling to 29.5° F., it required about 

 1^ hours for the temperature of tomato No. 1 to fall from 33.3° to 

 30.6° F. It is, therefore, possible, on account of this temperature 



