Chap. III.
ANNUALLY ACCUMULATED.
175
mingle the whole with vegetable débris, and to saturate it with their intestinal secretions.
Finally, no one who considers the facts given in this chapter—on the burying of small objects and on the sinking of great stones left on the surface—on the vast number of worms which live within a moderate extent of ground—on the weight of the castings ejected from the mouth of the same burrow—on the weight of all the castings ejected within a known time on a measured space—will hereafter, as I believe, doubt that worms play an important part in nature.
