BULLETIN 



Relative amounts of water-soluble salts recovered from heavily 

 manured soils on different dates. 



In parts per million of dry soil. 



If the observations made 206 days after applying the ma- 

 nure were reversed and the values which are assigned to the 

 Norfolk Sand were credited to the Janesville Loam the rela- 

 tions would have been more nearly what it was expected would 

 be found when they were brought into comparison, which was 

 not done until this writing in the June following. There is 

 nothing in the records which indicates that a transposition 

 could have occurred and while it is not impossible that the 

 jars containing the two solutions might have been reversed, it 

 is not likely that this did take place. 



If the results are properly credited in the table, we have the 

 Janesville Loam absorbing potash and phosphoric acid more 

 rapidly during 65 days than the Norfolk Sand, as, indeed, 

 from the physical standpoint, would be expected, but also, 141 

 days later, the reverse relation is brought out, the Janesville 

 Loam, imparting to the same amount of distilled water and in 

 the same time, 104.6 parts of potash and 63.3 parts of phos- 

 phoric acid, while the Norfolk Sand gave up but 62.2 parts of 

 potash and 36.9 of phosphoric acid. Btiit perhaps this rela- 

 tion, after all, is demanded on account of so much larger sur- 

 face over which the water flowed in passing through the Janes- 

 ville Loam. So much less was the frictional surface presented 

 by the Norfolk Sand that the 6000 c. c. of Water could have been 

 passed through it, under the pressure maintained on the Janes- 

 ville Loam, in 3 instead of 36 hours. Moreover, the depth of 



