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Updated: May 16, 2025
That this is indeed so, the following description will show. Beside the two qualities cold and warm the doctrine of the four elements pointed to two further qualities forming in themselves a pair of opposites, namely, dry and moist. Just as the four elements were seen as grouping themselves in two pairs, Fire-Air on the one hand,
Previous to this, man had felt currents of heat rising up to him from the earth: he had felt air surrounding him through tones; now, the watery element also penetrates his fire-air body, and he sees its ebb and flow as the alternate flaring up and dimming of light. But a change has also taken place in his soul.
Meanwhile he was performing the duties of an ordinary apothecary, and struggling against poverty. His treatise upon Air and Fire appeared in 1777. In this remarkable book he tells of his discovery of oxygen "empyreal" or "fire-air," as he calls it which he seems to have made independently and without ever having heard of the previous discovery by Priestley.
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