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Updated: May 8, 2025
Suppose, therefore, we had ascertained that the triturating power of subaerial denudation might in a given time in three, or six, or a greater number of millions of years pulverise a volume of rock equal in dimensions to all the present land, we might yet find, could we revisit the earth at the end of such a period, that the continents occupied very much the same position which they held before; we should find the rivers employed in carrying down to the sea the very same mud, sand, and pebbles with which they had been charged in our own time, the superficial alluvial matter as well as a great thickness of sedimentary strata would inclose shells, all or a great part of which we should recognise as specifically identical with those already known to us as living.
Nor should we forget, in considering the power which worms exert in triturating particles of rock, that there is good evidence that on each acre of land, which is sufficiently damp and not too sandy, gravelly or rocky for worms to inhabit, a weight of more than ten tons of earth annually passes through their bodies and is brought to the surface.
A very small beetle, the Trox, has the imprescriptible mission of purging the earth of the rabbits' fur rejected by the fox. Here structure explains the function. The intestine of the grub of the rose-beetle "is a veritable triturating mill, which transforms vegetable matter into mould; in a month it will digest a volume of matter equal to several thousand times the initial volume of the grub."
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