. The Philosophical magazine; a journal of theoretical, experimental and applied physics . Fi,^.7. Apparatus for calculating Efficiency. 193 dye-stuffs, one of the bydroxyl groups must bo in the ortho-position as regards the (—CO—) group in order that thecompound may be a dye-stuff. For there are numerous iso-mers of alizarin, but most of them are colourless, only qui-nizarin and xanthopurpurin possessing tinctorial properties;and in these, as well as in alizarin, one of the HO groups isin the ortho-position, thus :—

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