. The black scale. Scale insects. 162 UNIVERSITY OF CALIFORNIA EXPERIMENT Fig. 7.—Tracings of young black scales for a 2-hour period. Reduced 7 times. Temperature 83 degrees. Average distance 123 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 Quayle, H. J. (Henry Josef), 1876-; Rust, E. W. (Everett Winder), 1884-. Berkeley, Cal. : Agricultural Experiment Station

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscalein, bookyear1911