104 On some Chemical Agencies of Electricity. 



part only of the battery, from which the spark has been 

 drawn. 



We may judge from this hasty sketch that M. Heidman 

 is perfectly master of his .subject; that the numerous tacts 

 which at present form the whole of our knowledge. on Gal- 

 vanic electricity are classed in his work with method and 

 brevity. The publication of his first volume makes us wish 

 to see his continuatioa so much the more anxiously, as 

 M. Heidman does not always agree with those whose opi- 

 nions he details, and because he supports his own observa- 

 tions upon experiments peculiar to himself, and of which 

 he solicits the verification. 



XV. The Bakerlan Lecture, on some Chemical Agencies 

 of Eltctnc'Hy. By Humphry Davy, Esq. F. R. S. 

 M. R. I. A. 



[Continued from p. IS.] 



IV. On the Transfer of certain of the co?istitnent Parts of 

 Bodies by the Action of Electricity. 



JVi. Gautherot has stated*, that in a siiigle Galvanic 

 circle of zinc, silver, and water, in an active state, the oxide 

 of zinc formed is ratnoted by the siUerf; and Messrs. Hi- 

 sinser and Berzelius detail an account of an experiment in 

 which ;^()lutio^ of m-Lirlate of lime being placed in the posi- 

 tive part of a svphon, electrified by wires from a Voltaic 

 pile, and distilled water in the negative part, lime appeared 

 in the distilled water. 



These facts rendered it probable that the saline elements 

 evolved in decompositions by electricity v/ere capable of 

 being transferred from one electrified surface to another, 

 according to their usual order of arrangement ; but to de- 

 monstrate this clearly, new researches were wanting. 



1 connected one of the cups of sulphate of lime, men- 

 tioned pasj;e 12, with a cup of agate by asbestus; and, filling 



• Anvales dt Chimie, vol. xxxxix. p. 203. f Ibid. vol. li. p. 171. 



them 



