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[[strikethrough] 5 [[/strikethrough]] [[strikethrough]] 2 [[/strikethrough]] 57 CHARLES V. RILEY and L. O. HOWARD. Experiments with a Date-palm Scale. Insect Life, III, Nos. 11 and 12, August, 1891, pp. 441-445 A number of date-palm trees received in 1890 by the U. S. Department of Agriculture from northern Africa with a view to establish them in California proved to be badly invested with a Scale, Parlatoria zizyphi. After often repeated treatment with kerosene emulsions of various strengths the scales were finally exterminated without injury to the trees.