1919] 



Pendleton: A Study of Soil Types 



383 



And because the ranges in the sizes of the soil particles separated 

 by the Bureau of Soils method cut across those of the Hilgard 

 method, it is impossible to regroup the results so that the Bureau of 

 Soils grouping into textures may be applied. But without any such 

 scheme, desirable as it may be, it has been pointed out that there is 

 clearly apparent a rather wide variation in the analyses of the several 

 samples of a type. All the soils representative of a given type are by 

 no means closely similar to one another. 



Table 1 — Comparison of Textures 



Texture as judged in the field 



Texture determined by 

 mechanical analysis 



Note. — Textures not judged correctly in the field. 



Mechanical Analysis by the Burma of Soils Method. — Among the 

 other determinations made by the Division of Soil Technology on the 

 surface horizons of the twenty-four soils used in this investigation 

 was that of making the mechanical analysis. The tables show the 

 percentages of the several separates. In all cases the figures represent 

 averages of duplicate determinations and in some cases the averages 

 of quadruplicate determinations. With this method, as well as with 

 the Hilgard elutriator, there are shown wide variations between the 



