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...at the mouth of the burrows as worm-castings. Mr Darwin calculates that ' in many parts of England a weight of more than ten tons of dry earth annually...and is brought to the surface on each acre of land (forming a layer one-fifth of an inch in thickness) j so that the whole superficial bed of vegetable...

...that number, or 26,886, to the acre in corn-fields and pasture-lands; and as in many parts of England a weight of more than ten tons of dry earth annually...bodies and is brought to the surface on each acre, the whole superficial bed of North. FM. *.— A NORTH AND SOUTH SECTION THROUGH тнв SUBSIDED FLOOR...

...that number, or 26,886, to the acre in corn-fields and pasture-lands ; and as in many parts of England a weight of more than ten tons of dry earth annually...bodies and is brought to the surface on each acre, the whole superficial bed of vegetable mold must pass through them every few years. By triturating...

...mainly upon the surface about the mouths of the burrows. Darwin states that "in many parts of England a weight of more than ten tons of dry earth annually...through their bodies and is brought to the surface in each acre of land ; so that the whole superficial bed of vegetable mould passes through their bodies...

...the acre in corn-fields and pasture-lands ; and as in many parts of England a weight of more than ton tons of dry earth annually passes through their bodies and is brought to the surface on each aero, the whole superficial bed of North. ft». *.— A NORTH AHD SOUTH SECTION THROUGH тня SUBSIDED...

...than ten tons (10,516 kilogramme^ of dry earth annually passes through their bodies and is hrought to the surface on each acre of land; so that the whole superficial bed of vegetable mould passes through the:: bodies in the course of every few year?. From the collapsing...

...mouths of the burrows. Darwin states that "in many parts of England a weight of more than ten ton« of dry earth annually passes through their bodies and is brought to the surface in each acre of land; so that the whole superficial bed of vegetable mould passes through their bodies...

...winter they are completely hidden in their earth dwellings. In many parts of England, we are told, a weight of more than ten tons of dry earth annually passes through the bodies of these despised animals, and is brought to the surface on each acre of land, so that the...