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Tablk IX 



Pot 



No. 



Treatment. 



64 Steamed 



66 Steamed +infusion 

 68 Not steamed 



Dry Wt. 

 of crop. 



2.86 

 2.71 



2-93 



% Nitrogen 

 in crop. 



4.07 



3-99 



4. II 



Fig. 74 — Effect of additii^ cm infusion of unslerilized soil to a slenlized soil as indi- 

 cated by a crop of wheat four mouths after planting 



Pot J I — Soil Xo. 5 tut treated 



Pot jj — Soil Xo. 5 sterilized 



Pot 55 — Soil Xo. 5 sterilized and treated with 



an infusion of the same soil not sterilized 



Although the steamed soil to which the infusion was added began to 

 recover more rapidly from the effects of steaming than did the other 

 steamed soil, it did not continue to do so very long, for at the end of 

 six weeks the crop was at least no larger than that on the ; teamed soil 

 to which no infusion was added. 



At the time the croy)S on these pots were harvested the soils in l)oth 

 the planted and the unjtlanted yjots were analyzed. The results are 

 shown in Table X. 



