EXPERIMENT STATION BULLETINS. 



409 



^ S & 7 8 



cc. O./ /V ^^iz/y. 



/a // /Z 



Fig. 8. — Titration curves — silt loam soil. 



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



No. 1. After standing one clay, Ca(OH)2. 



" No. 2. After standing two days, Ca(OH)2. 



No. 3. Back titration of Ca(OH)2 series with HCl. 



No. 4. Initial titration curve, HCl. 



No. 5. After standing one day HCl. 



No. 6. Back titration of HCl series with Ca(OH)2. 



