"I have declared that saltpetre alone will decompound the substance of heat.—The following experiment proves it. I put one ounce of saltpetre purified for distilling, into a glass retort, and employed a moistened bladder, emptied of air, in lieu of a receiver. (fig. 3.) As soon as the saltpetre became red hot, it began boiling; and at that period of time the bladder was expanded from the air that passed over. I continued the distillation till the boiling in the retort ceased; and the saltpetre was on the point of penetrating through the softened glass retort. In the bladder I found the pure empyreal air, taking up the space of fifty ounces measure, This is the best and cheapest method of obtaining empyreal air."
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35. Experiment IV
https://en.wikiquote.org/wiki/Chemical_Observations_and_Experiments_on_Air_and_Fire
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Chemical Observations and Experiments on Air and Fire
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