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First edition of a fundamental work on chemistry. Scheele was the first to discover oxygen, but the publication of this work was delayed by two years, which allowed Priestley to publish the first account of the isolation of oxygen. "Scheele was an experimental genius; he made more discoveries of first-rate importance with fewer opportunities and scantier appliances than anyone else, and his skill, insight and power of illuminating experimental results have never been surpassed, if indeed they have ever been equalled" (Ferguson). Scheele also demonstrated in this book the photosensitive nature of chloride of silver, a discovery that led to photography. Very good copy. Copies are often described as lacking a half-title, but apparently none was printed.