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'What is it, thought I, running into a sort of mental dialogue with myself, and calling in what little true science I had learned, to aid me in fully testing the soundness of the notion, before I finally gave in to it; 'what is it that hardens the muscles, and compacts the human system? 'Thorough exercise, and constant use. 'Can these be had in the study-room? 'No. 'And what is the invigorating and fattening principle of the air we breathe? 'Oxygen. 'Can this be had in the close or artificially-heated room? 'No, except in stinted and uncertain proportions.
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