Note 139 — Chapter III · THE AMOUNT OF FINE EARTH BROUGHT UP BY WORMS TO THE SURFACE.
Reading edition
This conclusion, which, as we shall immediately see, is fully justified, is of some little importance, as the so-called bench-stones, which surveyors fix in the ground as a record of their levels, may in time become false standards. My son Horace intends at some future period to ascertain how far this has occurred.