Dalton (John) Experimental Essays on the Constitution of mixed Gases; on the Force of Steam and Vapour from Water...; on Evaporation; and on the Expansion of Gases by Heat...Read Oct.2, 16 and 30, 1801, extract from 'Memoirs of the Literary & Philosophical Society' vol.V pp.535-652 (Dalton paper pp.535-602), first edition, folding engraved plate, first leaf browned, disbound and becoming loose, preserved in modern cloth folder and red morocco-backed cloth slip-case, 8vo, Manchester, 1802.

⁂ The first formal enunciation of the law of gaseous partial pressures. The importance of these essays was recognised immediately and the discoveries helped to establish meteorology as a science.

Also containing William Henry's 'Review of some Experiments...to Disprove the Materiality of Heat' and John Gough's 'Investigation of the Method whereby Men judge, by the Ear, of the Position of Sonorous Bodies...' with another engraved plate.