hk. H. Loughridge—Distribution of Soil Ingredients. 19 
twice that of the others combined. Its insoluble residue is very 
small, while the soluble portion consists largely of free silica 
derived from hydrous silicates of the bases. 
Its volatile matter (which includes hygroscopic moisture left 
anganese exists only in the clay, a mere trace being 
found in the next sediment. 
_ the lime appears to be “ nowhere,” having probably been 
largely dissolved, in the shape of carbonate, by the large quan- 
tity of water used in elutrjation. Its inerease in the coarser 
Portions may be owing to its existence in the crystallized form, 
not so readily soluble. 
1s a loss in potash, magnesia and lime: which may reasonably 
be apposed to have been dissolved by the water of elutriation. 
Some of the soluble silica clearly remains undetermined in 
the coarser sediments, 
e differences in ferric oxide and alumina, shown through- 
out the analyses of this soil, may —— be accounted for by the 
sO i distribution of the particles of iron ore existing in the 
so 
~ ,.Of course the law of distribution of soil ingredients may 
differ in other soils; but the great distance from the point of 
soils of which this is a , probably render the above results 
of more than local copia, 
