. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Fig. Fig. 2. Fig. 2. Side view, looking outwards from the field. C is the strip of tin, two and a half inches wide, tacked against the lath, which is nailed on top of the board, eight or twelve inches wide. A little earth is gen- erally heaped against the board on the side looking from the field, to prevent the grasshoppers from creeping under where the inequalities or looseness of the ground would favor them. The operation of the tin p
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Fig. Fig. 2. Fig. 2. Side view, looking outwards from the field. C is the strip of tin, two and a half inches wide, tacked against the lath, which is nailed on top of the board, eight or twelve inches wide. A little earth is gen- erally heaped against the board on the side looking from the field, to prevent the grasshoppers from creeping under where the inequalities or looseness of the ground would favor them. The operation of the tin protective consists in the inability of the grasshopper to reach from the under surface of the lath. Fig. 1, around the edge of the tin to the upper surface of the lath, which would be necessary to enable it to get on the top of the protective and enter the field. The strip of tin should not be less than two and a half. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840
