Fig. 2. 



Tomatoes grown in turf in cool house, no manure added, a. Soil heated to 130 0 F. 

 b. Soil untreated, c. Soil heated to 200" F. 



I 



I 



a b 



Fig. 3. 



Young tomato plants showing retardation, even at this stage, in soil heated to 

 200 0 F., but accelerated growth in soil heated only to 130 0 F. a. Soil heated 

 to 200 0 F. Untreated soil. c. Soil heated to 1 30° F. 



