380 



University of California Publications in Agricultural Sciences [Vol. 3 



Mechanical Analysis 



Hilgard Elutriator Method. — That there is a wide variation be- 

 tween the samples is apparent (figs. 1-4). In fact, there is about 

 as wide a range of differences among the samples of the Hanford 



% 



45 



40 



35 



30 



25 



20 



15 



10 



0.25 



.05 



16 



32 



3 



7 



64 , mm. 



Fig. 2. Graph showing the results of the Hilgard elutriator method of 

 mechanical analysis on the three samples of Altamont clay loam. 



fine sandy loam and among those of the San Joaquin sandy loam as 

 between the two types. The most outstanding differences are where 

 they ought to be, to show the differences that the type names presup- 

 pose, i.e., in the "coarse sand" (64 mm.) and the "grits." The sam- 

 ples of the San Joaquin sandy loam average a larger proportion of 

 each of these separates than do the Hanford fine sandy loam soils. 



