30J Account df Galvanic Co7)ih'tnations 



none have diftingiiiflied themfelves more than Schcele anel 

 Dr. Prieftley. The former a native of Germany, but fettled 

 in Sweden, invented very fimple procelfes, yet well calcu- 

 lated to anfwer the propofcd end, for examining thcfe gafes, 

 by which means he difcovered new kinds, and proved the 

 exiftence of thofe already known in a much clearer method 

 than had been done before in his Ahhaiidlang von der Luft 

 'itnd dem Veiter nehjl ehiem Vorhericht von T. Bergman, Upfal 

 and Leiplic 1777. 8vo. ; and in Kongl. Svenjk, VetenJ'kap. 

 Academ.. Handlings ^774- ?• 84. The latter, feeing furniflied 

 vith a nwre extenfive apparatus, placed in a clearer point of 

 view, not only the nature and differences of the gafes before 

 difcovered, but difcovered new ones alfo. An account of his 

 experiments may be feen in Experiments and Obfervation* 

 on the different Kinds of Air, London, 8vo. vol. i. 1774, 

 vol. ii. 1775, vol. iii. 1777 ; Experiments and Obfervation* 

 relating to various Branches of Natural Philofophy, with a 

 Continuation of Obfervations on Air, 8vo, vol. i. London 

 J779, vol. ii. Birmingham 1782, vol. iii. 1790; Direftiona 

 for impregnating Water with fixed Air, 6rc. London 1772, 

 8vo.; i'hilofophical Tranfa<5lions of the American Society 

 3796. 



XXXV. An Account of fome Galvanic Combinations^ formed 

 by the Arrangement of Jingle Metallic Plates and Fluidsy 

 analogous to the new Galvanic Apparatus of Mr. V^olta, 

 By Mr. Humphry Daw, Lcdurer on Cbemijlry in the 

 Royal Injiitution *. 



I. x\LL the galvanic combinations analogous to the new 

 apparatus of Mr. Voha, which have been heretofore defcribed 

 by experimental ifts, confill (as far as my knowledge extends) 

 of feries containing at leaft two metallic fubftanccs, or one 

 metal and charcoal, jmd a ftratum of fluid. And it has been 

 generally fuppofed that their agencies are, in fome meafure, 

 connected with the difierent powers of the metals to conduct 

 electricity. But I have found that an accumulation of gal- 

 vanic influence, exattly fimilar to the accumulation in the 

 avmmon pile, may be produced by the arrangement of fingle 

 metallic plates, or arc?, with diflerent ftrata of fluids. 



The train of reafoning which led to the difcovery of this 

 fael, was produced by the obiervation of fome phasnomena 

 relatino- to the connection of chemical chantrcs with the evo^ 

 lutlon of galvanic power. 



■* FroiT! 7fai/i*^i'i/is of ibe Rojal Sotieij cf London for 1801. 



It 



