The word ‘dense’ has been used in writings on microtechnique with 3 different meanings, to convey either (1) that a microscopical object is dense in the physical sense, or (2) that it is close-textured and therefore somewhat impermeable to the large, complex ions of certain dyes, or (3) simply that the object colours strongly with some particular dye. It is urged that the word should be used in microtechnique only in the first or physical sense.

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