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Common Earth-worms

Common Earth-worms.jpg ThumbnailsA Ganglion of a LeechThumbnailsA Ganglion of a LeechThumbnailsA Ganglion of a Leech

Earth-worms are found throughout the world. Though few in genera, and not many in species, yet they make up in individual numbers, for it has been estimated that they average about one hundred thousand to the acre. Our American species have never been monographed, which renders it impossible to judge of their probable number. Their castings may be seen on commons, so as to cover almost entirely their surface, where the soil is poor and the grass short and thin, and they are almost as numerous in some of our parks where the grass grows well and the soil appears rich.