Page:The Formation of Vegetable Mould through the Action of Worms (1881).djvu/340

326 * Worms,  contents of intestines, acid, 51
 * their castings, acid, 52
 * power of suction, 56
 * plugging up their burrows, 58
 * intelligence of, 64
 * formation of their burrows, 98
 * number of, living in a given area, 158
 * penetrating ancient walls, 188, 209
 * gizzards of, and the trituration of the contained stones, 246
 * prefer to live in fine earth, 291
 * Wright, Mr., on the age of Wroxeter, 221
 * Wroxeter, old Roman town of, 221