42 



From the data of this table it appears that all but three of 

 the ingredients of the manure which were readily soluble in 

 distilled water/ have been held back by the soils in amounts 

 which have increased a little less than in proportion to the 

 amounts added. The SO 4 , HCO 3 and Cl have, without excep- 

 tion, gone into solution in increasing quantities as the amounts 

 of manure were increased. In other words, all of these ingre- 

 dients that were shown to be present in the unmanured soil 

 plus all that were added to the soils were recovered after 65 

 days of contact, anid in addition thereto the amounts which 

 are given in the table, designated by minus signs. 



The mean amounts of the different salts actually recovered 

 from the two groups of soils after 65 days of contact with the 

 manure are given in the next table. 



Mean amounts of salts recovered from the four poorer and four 



stronger soils after 65 days' 1 contact with, different amounts 



of manure. 



From this table it will be seen that with 25 tons of manure 

 per acre the four stronger soils, after 65 days, gave over to the 



