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and to demonstrate facts considered impossible by his compeers in Science. Of this quality the detection and estimation of Wood Spirit in Alcohol is a striking instance. From the beginning of his career he was noted as an experimental operator. We have seen a letter from the late Professor, E. D. Clarke, of Cambridge, in which, writing to Dr. Ure in 1822, he says:— “I wish very much you had examined the small quantity of gas which you collected from Plutonium. It remained on my
