Texture of Soils. 



109 



of grains so small that 25,000 of them must bo pi; 

 by side to span a linear inch. 



130. Number of Grains of Soil in a Cubic Inch. If soil 

 grains were perfect spheres like shot and in a given soil 

 they were all of a single size it would be a simple matter to 



FIG. 34. Showing the effect of size and ;irr:iii^fiin-iil <>f soil trrnins on 

 the pore space and upon the movement of air and writer through a 

 soil. 



