"The feeling of it to my lungs was not sensibly different from that of common air; but I fancied that my breast felt peculiarly light and easy for some time afterwards. Who can tell but that, in time, this pure air may become a fashionable article in luxury. Hitherto only two mice and myself have had the privilege of breathing it."

Source : Joseph Priestley (1775). “Experiments and Observations on Different Kinds of Air: Vol. II. By Joseph Priestley, ...”, p.102

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