34 



2. Reaction With Litmus. 



The reaction of botli sets of samples from each field was tested 

 with litmus paper. Strips of sensitive red and blue litmus paper were 

 placed in direct contact with the soil, the latter was then moistened with 

 distilled water and after a half hour the reaction was noted. 



Carrington Silt Loam. On the Kansan the soils of this type 

 (Table 25) all proved acid, while on the Late Wisconsin the acidity was 

 found less general, the lower two sections being neutral in Field II and 

 in Set 1 of Field TIT. The third foot in the second set of Field V is 

 also neutral. 



Table 23. — Acidity as found by the litinits method. .Samples taken from five 

 fields on Carrington silt loam. 



Fargo Silt Loam. Nearly all of the soils on the Kansan (Table 

 26) were neutral, the second set from Field III being the only one of 

 the ten .sets in which the reaction was acid for all four sections. On 

 the Late Wisconsin the acidity was more marked, approximately half 

 of the samples being neutral and half acid. 



Table 26. — Acidity as found by the litmus method. Samples taken fro)n five 

 fields on Fargo silt loam. 



Carrington Loam. On the Kansan (Table 27) every sample re- 

 acted acid, while on the Late Wisconsin all were acid with the excep- 

 tion of the surface foot in three sets. 



