AHSOHI'Tlo.N OF SAI.TS i;v SOILS. 



Amounts of potash absorbed by soils recovered with dilute acid 



solutions. 



To obtain the results with carbonic acid, soil was used which 

 had previously been treated with a potassium chloride solution 

 and had then been washed with water equal to 4.5 to 5 times 

 the volume of the chloride solution. After this treatment the 

 two samples, under experiment, still retained 1535 and 1226 

 parts per million of absorbed K 2 O. The soils were then di- 

 gested with 5 times their weights of distilled water, previously 

 saturated with carbonic acid, in closed flasks during 8- days, 

 the water being recharged with carbonic acid 4 times in that 

 interval. 



It would have been extremely helpful, in considering these 

 results, if there had been introduced into the series sam]>l<s 

 which were simultaneously treated with distilled water alone. 

 In his preliminary treatment of a sample of the same soil he 

 did recover with water 24 parts per million of K 2 O from the 

 air-dry soil, equal to 25.77 parts of the water-free soil. 



In the cases treated with dilute acetic acid the soil was di- 



