. An annotated list of the important North American forest insects. Forest insects. Fig. 17.—A, Impioperly constnicted concrete flooring: a, Gravel or cinders loosely cemented with coarse concrete, 3 inches thick, but with many crevices and holes ; b, .'folid, den,se concrete, '2 inches thick : r, 2 by 4 inch untreated wood sleeper set in moist concrete over the srout; d, %-inch pine flooring nailed to sleepers. U, Prop- erly constructed concrete flooring : a, Gravel or cinders loosely cemented with coarse concrete, but with many crevices and holes; h. asphalt waterproofing 14 inch thick; c, d
. An annotated list of the important North American forest insects. Forest insects. Fig. 17.—A, Impioperly constnicted concrete flooring: a, Gravel or cinders loosely cemented with coarse concrete, 3 inches thick, but with many crevices and holes ; b, .'folid, den,se concrete, '2 inches thick : r, 2 by 4 inch untreated wood sleeper set in moist concrete over the srout; d, %-inch pine flooring nailed to sleepers. U, Prop- erly constructed concrete flooring : a, Gravel or cinders loosely cemented with coarse concrete, but with many crevices and holes; h. asphalt waterproofing 14 inch thick; c, dense concrete. '1 inches thick ; (f^ 2 by 4 inch treated wood sleeper .set in a groove in concrete which insulates it from termites in the earth ; r-, %-inch flooring nailed on sleepers; f, metal collar around pipe which runs down through the concrete (this collar should be soldered to the pipe and embedded in the concrete) ; ff, shoulder of concrete at point of wall and concrete floor to avoid a right-angle connection and consequent cracking for this purpose are crude carbolic acid at the rate of 1 gallon to 1,000 square feet; bichloride of mercury at the rate of 49 ounces per 1,000 square feet; or copper sulphate at the rate of 113 ounces per 1,000 square feet. Chlorinated naphthalene is a suitable poison for cane-fiber 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 Craighead, Frank C. (Frank Cooper), 1890-; Perry, George S; Snyder, Thomas Elliott, b. 1885; Hopkins, A. D. (Andrew Delmar), 1857-1948; MacAloney, Harvey John, 1896-; Graham, Samuel Alexander, 1891-; Peirson, Henry Byron, 1894-; Herrick, Glenn W. (Glenn Washington), 1870-1965; Britton, Wilton Everett, 1868-1939; Tanaka, T; Sanders, J. G; Howard, L. O. (Leland Ossian), 1857-1950; Chittenden, F. H. (Frank Hurlbut), 1858-1929; St. Geor
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Keywords: ., bookauthorhopkinsadandrewdelmar, bookcentury1900, bookdecade1900
