| http://www.w3.org/ns/prov#value | - I had gradually discovered that what was mainly wanting, to overcome the difficulties of that branch of the subject, was a comprehensive and at the same time accurate view of the whole circle of physical science, which I feared it would take me a long course of study to acquire; since I knew not of any book, or other guide, that would spread out before me the generalities and processes of the scie
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