The book Principles of Logic was written by author George Hayward Joyce Here you can read free online of Principles of Logic book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Principles of Logic a good or bad book?
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It is plain that without some method of simplifying the con- ditions, it would have been difficult, if not impossible, to obtain conclusive evidence of this truth. It will be seen that although Observation may take place without set purpose, — and indeed the histoiy of science records not a few famous discoveries made by what may be called chance, — Experiment necessarily requires an hypothesis. Unless we frame some sup- position, and make our e3q)eriment to the end that we may know whether thi...s supposition is correct or not, no experiment can take place. To experiment is to question Nature; and our question must take some clearly defined form. The mere use of a scientific instrument does not in itself constitute an experiment. We do not speak of experimenting, but of observing with a microscope. To make an experiment, it is not enough that the observer himself ^ould be set in new and special circumstances. It is requisite that the object observed be placed under new conditions, and further that these new conditions should in some way modify its action.
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