Abstract
THE "Catalogue of Chemical Products "issued by the British Drug Houses, Ltd., is now so well known to chemists that there is little need to do more than direct attention to the new edition, issued on September 2I, which includes several thousand chemicals, many of them recent additions. The firm caters not only for chemical laboratories, but also supplies an extensive range of requisites for microscopic work, such as stains, mounting media, embedding materials, liquids of known refractive index, etc. Special mention may be made of the list of about 50 indicators for which the catalogue gives a useful table showing the PH range in each case, including the universal indicator, a mixture to be used for determining rapidly and in one operation the approximate PH of a solution by the colour developed.
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