Page:Tree Crops; A Permanent Agriculture (1929).pdf/24



FIG. 3. Top. No gully, but plucking raindrops have carried away many feet of top soil in this Algerian wheat land. (Photo J. Russel Smith.)-FIG. 4. Center. The most familiar type of erosion. Note the man and note the place-Illinois, the temporarily rich, the supposedly level. (From Univ, of IlI. Circular No. 290.)-FIG. 5. Bottom. A six-foot man stands in the corn beneath the arrow. The worthless stalks by the hat measure the ruin of the hill—typical of forty-five American states. (Photo J. Russell Smith.)