64 



A general relation was found to exist between the calcereousnes.s 

 and the texture, the- finest txtured soils retaining the most carbonate 

 and the coarsest the least. 



With the two members of the Carrington series the degree of 

 acidity, as indicated by three different methods, the litmus, the Truog 

 and the ammonia, is the more pronounced on the Kansan. With the 

 loam the carbon dioxide content is alike on both drifts, carbonates 

 having been removed to a depth in excess of three feet, but with the 

 silt loam, while on the Kansan the leaching has been as extensive as 

 on the preceding type, considerable amounts of carbonate still remain 

 in the third foot on the Late Wisconsin. On the fields of the Fargo 

 type much less carbonate has been removed in the case of either drift 

 and the reaction is less frequently acid on the Kansan than on the 

 younger drift. 



On the Kansan the calcium carbonate has been leached out to 

 a depth greater than three feet on both the Carrington types, while 

 on the Late Wisconsin the same is true for the Carrington loam but 

 there is still an appreciable quantity in the third foot-section of the 

 Carrington silt loam. 



The lime other than that in the form of carbonate is similar both 

 in amount and distribution on the two Carrington types, but in the 

 first two feet in the Fargo silt loam is considerably the higher on the 

 ICansan. 



The magnesia on each type is very similar from drift to drift, 

 but is considerably higher in the l^^argo silt loam than in the other 

 types. 



The ratio of total lime to magnesia is slightly the higher on the 

 Late Wisconsin, this being due to the greater amount of calcium 

 carbonate on the two of the types on the latter. The ratio of lime, in 

 the form of silicate, to magnesia is very similar for each type from 

 drift to drift, except with the Fargo silt loam where it is the lower on 

 the younger formation. 



The phosphoric acid is the higher on the Kansan, this being true 

 for each of the three types. The amounts were determined in all ten 

 fields on each type and with every type the individual fields on the 

 Kansan showed an amount higher than or practically equal to that 

 in the field on the Late Wisconsin richest in this constituent. On the 

 two -prairie types it shows a decrease from the surface downward, but 

 with the forest type the vertical distribution is irregular. 



Both potash and soda are very similar in corresponding sections 

 from the two drifts except that with the Carrington loam the potash 

 is slightly the higher and the soda distinctly the lower on the later 

 glaciation. 



In volatile matter the corresponding sections from the two drifts 

 are very similar except that the Fargo silt loam in the surface six-inch 



