17 



level, in which on tlic hiter drift they are abundant. An acid reaction 

 is usually found in all three levels on the Kansan but only rarely on the 

 Late Wisconsin, and then only in the surface section. On the latter 

 drift, the total potash was much higher in the first two sections and 

 slightly higher in the third, while nitrogen was considerably higher in 

 all three levels. In both the fir.st and third .sections the total phosphoric 

 acid averaged higher (^n the Late Wisconsin, while the subsurface 

 showed no difference. 



AIcMiller (25) in an investigation of the soils of the most south- 

 erly tier of counties in iNIinnesota, begun in the autumn of 1913 and 

 almost completed before the appearance of the Brown report, con- 

 ducted a somewhat parallel study. It dififered in general conception 

 from the former in that only virgin fields, and these on till plains and 

 terminal moraines, were selected ; the sampling was in three one-foot 

 sections, five fields being dealt with in each county. The proportion of 

 gravel and the moisture equivalent are reported for every sample, thus 

 permitting a read} recognition of the general character of the soil and 

 even the identification of the soil type. 



Five of the fields sampled by McMiller were on the Kansas, all 

 these being near Spring Valley and on Carrington loam, while 24 were 

 on the Late Wisconsin, four near Albert Lea. five near Wells, five near 

 Fairmont, five near Jackson, five near Worthington and five near 

 Adrian. These 24 fields were distributed among five different types. 

 Carrington loam, Carrington silt loam, Fargo silt loam, Fargo clay 

 loam and Barnes silt loam. When the averages for the five fields near 

 Spring Valley are compared with those for the three on the same soil 

 type near Albert Lea. which constituted the most easterly Late Wiscon- 

 sin fields, they being about 50 miles to the west, no great differences in 

 properties are shown (Table 4). However, when the averages of all 

 the Late Wisconsin fields are compared with those of the five Kansan 

 the differences are more similar to those reported by Brown. 



Table ./. — Comparison of Carrington loam at Spring Valley, on the Kansan, 

 xvith that at Albert Lea, on the Late Wisconsin, from McMiller's data. 



•Average of four fields, including one on Carrington silt loam. 



