. Bulletin of the Department of Agriculture. Agriculture; Agriculture. FliJ 3.—Layers No. 1, No. 2, and No. 23 of lead alloy rolled 27 times around an infested section of oak. Shows how the numbers of beetles penetrating the alloy kept diminish- ing as thicknesses increased. Thirty-seven went through the first, 14 through 12, and only 3 through 23 thicknesses; two of these went through the 24th but were stopped by the 25th. This was the greatest penetration obtained. (Table 2, No. 55a.) Photo- graph by H. E. Burke. Fig. 4.—Beetle in gallery constructed in 30-min. (l-J-inch) cork. A num er
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. FliJ 3.—Layers No. 1, No. 2, and No. 23 of lead alloy rolled 27 times around an infested section of oak. Shows how the numbers of beetles penetrating the alloy kept diminish- ing as thicknesses increased. Thirty-seven went through the first, 14 through 12, and only 3 through 23 thicknesses; two of these went through the 24th but were stopped by the 25th. This was the greatest penetration obtained. (Table 2, No. 55a.) Photo- graph by H. E. Burke. Fig. 4.—Beetle in gallery constructed in 30-min. (l-J-inch) cork. A num er of other beetles were found in similar situa- tions, the corks being used as stoppers to vials containing specimens in alcohol. Enlarged 2^ times. Photograph by H. E. Burke. THE LEAD-CABLE 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 United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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