The Formation of Vegetable Mould, Through the Action of Worms, with Observations on Their Habits

9 inches accumulated acetic acid acid action of worms alimentary canal amount angle animals annelids apex appear basal base Beaulieu Abbey beneath the surface blown broken brought buried burrows calciferous carbonic acid cent chalk concrete covered depth disintegration doubt dragged drawn earth feet field flints floor formed fragments fresh castings gizzards glands grass ground heavy rain Hensen holes hypocausts inches beneath inches deep inches in thickness inches thick inclined surface intestines Knole Park lamellæ land large number larvæ layer leaf leaves ledges Leith Hill Place lime Maer Hall manner matter mortar mouths nearly northern room objects observed particles pasture pavement penetrated Perrier petioles pharynx places ploughed plugging pots probably Roman villa rubbish sand seen seized side Silchester slope soil square yard Stonehenge stones subsided swallowed tesselated tiles tips trench triangles triturated turf upper vegetable mould walls washed weight whilst worm-castings