EXPERIMENT STATION BULLETINS. 



403 



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10 

 9 



6 



6 





4 

 3 



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o.c, OJA/ ^fwV 



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I'U. 2 — Titration curves — me limn san'l soil. 



Curve 



No. 

 No. 1. 

 No. 2. 

 No. 3. 

 No. 4. 

 No. 5. 

 No. 6. 



Initial titration carve, Ca(On)a 



.\fter standing one day, Ca(0H)2. 



After standing two days, Ca(0H)2. 



Back titration of Ca(OH)2 series with AlsCle. 



Initial titration Curve, AI2CI0. 



After standing one day, AhCle. 



Back titration of AI2 Cls series with Ca (OH) 3. 



