Page:Tree Crops; A Permanent Agriculture (1929).pdf/255



FIG. 82. Left. Black walnut trees in J. Russell Smith's fence corner, grafted to Stabler black walnut, have borne several crops. (Photo J. Russell Smith.)—Fig. 83. Center. Fruit cluster of a Japanese walnut. (Courtesy J. F. Jones.)—FIG. 84. Right. Cluster of cork oak trees occupying rocky knoll in Portuguese wheat fields. Typical of a method of land utilization that might produce nearly all the nuts needed in America, leaving other crop area unaffected.