EXPERIMENT STATION BULLETINS. 



405 



// 



/o 



9 



8 







/o 



// /^ 



Fig. 4. — Titration curves — silt loam soil. 



Curve No. 0. Initial titration curve, Ca(0H)2. 

 After standing one day, Ca(OH)2. 

 After standing two days, Ca(OH)2. 

 Back titration of Ca(0H)2 series with AhCle. 

 Initial titration curve, AUCle. 

 After standing one day, AhCU. 

 Back titration of AhCls series with CafOH)?. 



