14 BULLETIN 818, IT. S. DEPARTAIEXT OF AGRICULTURE. 
4. In shallow benches an application of boiling water at the rate 
of 7 gallons per cubic foot of soil resulted in the practical elimination 
of the parasites. 
5. For use in treating seed boxes this method will find an imme- 
diate and practical application, particularly in connection with the 
boys' and girls' garden-club work. The size of the box or flat com- 
monly used is 14 by 30 by 3 inches, and to treat this ih gallons of 
boiling water is necessary. 
6. As a further result of these treatments there was in all cases a 
marked increase in the percentage of germination and in the size 
and vigor of the plants grown in the treated soil as compared with 
the checks. 
7. The treatments which were effective in killing the pathogenes 
maintained the temperature of the soil above 5o° C. for 30 to 60 
minutes, as indicated by a thermometer inserted 3 to 4 inches below 
the surface of the soil. 
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