riallines. That the microscopical world hasbeen pursuing a phantom, and adopting afallacy. That polarization of light in theexamination of these and analagous testsis a deceitful servant of the microscopist.That obliaue illumination^ is another deceiver. That ifM Nobert were to attempt to fill his… … Test for Copper and Tin In Extracts. The poisonous nature of copper, and, to a less degree, oftin, makes the following method of testing for them in an ex-tract, as described by Hager, both interesting and useful,for either of these metals may have been dissolved from thewalls of the vessel in…
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