266 



Bulletin 275. 



Fig. 75 — Effect of adding an infusion of unsterilized soil to a sterilized soil as indi- 

 cated by the wheat plants about six months after planting 



Pot ji — Soil Xo. 5 untreated 

 Pot jj — Soil A'O. 5 sterilized 

 Pot jj — Soil iVo. 5 sterilized and treated with 



an infusion of tlie same soil not sterilized 



Table X. — Effects of Infusion of Unsteamed Soil on Steamed Soil Six 



Weeks After Infusion Was Added. 



