14 BULLETIN 818^ U. S. DEPAETMEE-T 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 4^ 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 55° 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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