Abstract
IN reference to Mr. Onslow's letter on this subject in NATURE of November 17, I may say that it requires some care to prepare specimens for the pressure test. The chitinous coat is thick, and is softer below than it is at the colour-producing surface. The inner layers should be removed so far as possible, and the test-piece (which should not exceed 1/50 in. in diameter) cut from the remaining part.
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MALLOCK, A. Metallic Colouring of Beetles. Nature 108, 432–433 (1921). https://doi.org/10.1038/108432b0
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DOI: https://doi.org/10.1038/108432b0
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