FROST INJURY TO TOMATOES. 7 
a3 
FAHRENHEIT 
FROIT*Z 
MIDE \ 
FRUITS 
INSLDE 
= 32) 
PAHRENHEIT 
DEGREES 
18 
PENSE ass 
fetes lair gael 
AOOAM S00AM 
\Z00AM a Z00AM 300AM 
Fic. 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 
14 hours for the temperature of tomato No. 1 to fall from 33.3° to 
EtGo “It. is, therefore, possible, on account of this temperature 
