248 GALVANISM. 



grains, whence it follows that 100 parts of cinnabar; con. 



tain by analysis 



Mercury . . 85,0 



Sulphur . . -"Ij^S 



XIV. 



Notice of some Experiments made by the Galvanic Society 

 at Paris*. 



Pile without I.alvJLo MARECIIAUX, of Wesel, correspondent 

 any moisture, of the Galvanic Society, announced to them that 

 he had determined that water, whether pure or mixed 

 with an acid, or charged with any salt, is not indispensa- 

 bly required for producing the eft'ects of galvanism. He 

 added, that some time ago he had constructed columns of 

 zinc and brass with the interposition of discs of card, not 

 moistencdy which were very useful. The Galvanic So- 

 ciety was of course desirous of verifying a fact of this 

 nature, and determined to repeat the experiments of M. 

 Marechaux, as described in his letter, 

 —verified by Discs of zinc, which had been before used, were cleaned 

 experiment. and restored to their usual polish. Similar pieces were 

 made out of new brass, A vertical column of 49 pieces 

 of discs was formed by the interposition of pieces of card, 

 not moistened, standing upon a plate of brass, of greater 

 dimensions, having three holes near its edges, through 

 which, cords of silk were passed iu order to support the 

 whole apparatus. These cords were tied together at top, 

 and the whole column suspended by them. This pile 

 It was weak, which M. Marechaux distinguishes by the name oiColonne 

 pendiiley was put into communication with the electric 

 micrometer of M. Marechaux, simplified by M. Veau de 

 Launayf and it manifested an intensity of 360 degrees J, 



which 

 "* Annales de Chimie, Jan. i8o6. 



f See Journ. de Phys. Messidor, an. XIV. — See also our Journal, 

 XIV. p. 350.~N. 

 1 By intensity we deii9te the measure of the distance, at which 



a leaf 



