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1.) A n Improved Soxhlet Extractor. WHEN using the ordinary form of Soxhlet extractor, there is always a doubt as to the exact time when the substance is completely extracted, unless the whole apparatus is taken to pieces, and a test made by putting a fresh supply of the solvent into the extractor. As a rule, therefore, tbe extraction lasts far longer than is necessary, and this involves not only loss of time but also of the volatile solvent. To avoid this, I use a Soxhlet extractor, fitted updoi:10.1039/ct8895500359 fatcat:qbalmm5trjfkvhyc7rkooyljsu