London: J. Johnson, 1801. 12mo in-6. xv, [i], 221, . SECOND EDITION. Lacking final 2 pages of publisher’s advertisements. Very attractively bound in diced calf with decorative gilt frame, border, board edges, and inside dentelle, also with gilt embellishments and lettering on the spine, plus marbled edges and end papers; light scattered foxing, mostly on the first and last 10 pages. Illegible signature on the title and the bookplate of Arnold Thackray on the paste-down. Item #14771
Second edition. This enduring and important work sprang from a set of lectures delivered by the author in 1798–1799. Successive editions kept its content up to date, and the title was changed with the sixth edition to Elements of chemistry. Henry’s major experimental work was on the physical and chemical behavior of gases, his most personal and original contribution being that now known as Henry’s law, enunciated in 1804: “At a constant temperature, the amount of a given gas that dissolves in a given type and volume of liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid.” In the theoretical basis of this work his friendship with Dalton was beneficial to both men, since their results were seen to be interrelated.
Henry (1774–1836) was a chemist, physician and secretary-companion to Thomas Percival (1740–1804), the leading physician in Manchester and a pioneer of medical statistics and epidemiology. He became increasingly attracted to chemistry and published several papers. Henry was extremely influential as a recorder of experimental results, and as an exponent of the state of chemical science. He was awarded the Copley medal by the Royal Society in 1808, in recognition of his existing record of research, notably on the solubility of gases, and was elected FRS in 1809.