"On the invariability of law depends the security of scientific experiment, and all power of planning a result and of predicting the future. On this the chemist rests, sure that Nature will ever respond in the same way, if he be precise in putting his questions. A variation in his results is taken by him as implying a change in his procedure, not a change in Nature... In all worlds increasing knowledge means increasing power, and omniscience and omnipotence are one."

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