Page:The Formation of Vegetable Mould through the Action of Worms (1881).djvu/337

Rh *Perichæta, naturalized near Nice, 106
 * Perrier, worms surviving long immersion, 13
 * on the calciferous glands, 44
 * on the action of the pharynx, 56
 * on the burrowing power of worms, 99
 * on naturalized worms, 106
 * on worms killed by acetic acid, 159
 * on the gizzards of worms, 246, 249
 * Petioles of Clematis, 77
 * of the ash, 79
 * Pharynx, action of, 56
 * Pike, stupidity of, 94
 * Pine-leaves used in plugging up burrows, 58, 70
 * lining burrows, 112
 * Pipes, formation of, in the chalk, 137
 * Playfair on Denudation, 290
 * Ploughed fields, old, 292
 * Plugging up of the burrows, 58
 * use of the process, 62
 * Prehension, power of, by worms, 56


 * Qualities, mental, of worms, 34


 * Ramsay, Mr., on the sinking of a pavement undermined by worms, 192
 * on Denudation, 231
 * Remains, ancient, buried by worms, 176
 * Rhododendron leaves, 69
 * Richthofen on dust deposits in China, 237
 * Robinia, petioles of, 81
 * Rocks, disintegration of, aided by worms, 240
 * triturated in the gizzards of worms, 249
 * Rolling down of dry castings, 275
 * Romanes, Mr., on the intelligence of animals, 95