1919] 



Pendleton : A Study of Soil Types 



385 



samples of a given type. But the graphs of the percentages (figs. 

 5-8), determined by the Bureau of Soils method for the several types 

 are not as closely similar as the graphs of the elutriator results for 

 the same types. That is. using the Bureau of Soils method, the graph 

 of the Hanford fine sandy loam does not resemble that of the San 

 Joaquin sandy loam as much as do the graphs of the results made 



Fig. 



.00") .005-.05 .05-.10 .10-.25 .25-. .5 .5-1.0 1.-2. 



6. Graph showing the results of the Bureau of Soils method of 



mechanical analysis on the three samples of Altamont clay loam. 



upon the same soils by the Hilgard elutriator method. This would 

 lead one to believe that the Bureau of Soils method of mechanical 

 analysis is the better suited for separating soils into groups ; even 

 though these soils which were classified in the field according to the 

 differences which are the more prominent would be expected to show 

 greater differentiations when examined by the Bureau of Soils labora- 

 tory methods. 



