77/1774 Boyle, R. Essays Of the Strange Subtilty, Great Efficacy, Determinate Nature of Effluviums. To which are annext New Experiments To make Fire and Flame Ponderable. Together with A Discovery of the Perviousness of Glass. London, Printed by W.G. for M. Pitt, 1673, 1st ed.?, 5 parts in 1 vol., 5 div. title-p., later giltlettered hcalf, modern hcl., sm. 8vo.

- Lacks general title-p. and "An Advertisement to the Reader"; part 1 div. title-p. strengthened/ repaired w. tape; first 4 lvs. sl. stained; part 3 later owner's annot. on div. title-p.; sl. wormholed in lower outer corner; (4 lvs. repaired); part 4 one leaf torn, repaired w. tape; new endpapers.

= The first edition of Boyle's important work on effluviums comprises 5 parts: 1. Strange subtitly of effluviums; 2. Great efficacy of effluviums; 3. Of the determinate nature of effluviums; 4. New experiments to make the parts of fire and flame stable & ponderable; 5. A discovery of the perviousness of glass to ponderable parts of flame. Fulton 105-107; PMM 141; Wing 3951-3952. "Effluviums is one of the most important but perhaps less widely known works of Boyle and a most significant one. Had Boyle been bolder in his conclusions which he drew from his experiments on oxidisation, he would have forestalled phlogiston theory which was problematic to chemistry in the eighteenth century" (Fulton).