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“ pulverize them to the finest degree ima-“ ginable, and mix them as confusedly“ together as possible, and let them fall“ through a dry fluid, such as the air, they“ will settle just in the same confused state“ as they were; if you permit them to sub-“ side through water, they will settle more“ or less in parallel strata. Indeed it re-“ quires twenty or thirty times the quantity“ of water to earth to make this layer-like“ subsidence tolerably apparent even in“ the mixture of but three or four bodies;“ but the greater quantity of water you“ use, and the finer you pulverize the sub-“ stances, the more apparent and regularthe strata will be.” (P. 269.)

According to Werner, strata are fromfour to six feet apart in the older form-ations, but less distant in the newer.

Hutchinson observes a , “ that in the mid-u land counties of England the strata are“ commonly thin near the surface, and be-“ come gradually thicker in proportion toa Hutchinson’s Works, vol. xii. p. 264.