124 



Amounts of potash absorbed from different solutions. 



These results appear to establish, clearly, that all salts of 

 potash are not absorbed in like amounts from solutions contain- 

 ing 1 the same amounts of K 2 ; the smallest absorption occurring 

 with the chloride and the largest with the phosphates. 



Heating to boiling for one-fourth hour has increased the ab- 

 sorption very materially while we have found that heating soils 

 to dryness increases the amounts of most salts which may be re- 

 covered from them with distilled water, as pointed out in Bul- 

 letin B, p. 64. 



In another series of experiments where Dr. Peters varied the 

 time of digestion from % hour to 14 days, using the same KC1 

 solution:, there was no certain increase beyond 8 hours, and the 

 difference between 14 hour and 14 days is only 



2037 1417 =620. 



Peters miade another series of observations in which he treated 

 four different soils with the same solution of potassium chlor- 

 ide containing 2355.5 parts per million of K 2 O, using 250 c. c. 

 of the solution to 100 of soil. These were the mean results of 

 his determinations : 

 Amounts of potash absorbed by four soils from a solution of KCl. 



