jlit Experimenis with Vottcfs Galvanic Apparatus, 



of Woolwich, publifhed in Nicholfon'g Journal, that he haa 

 formed the arbor Dianae, and had reafon to believe that he 

 h^ad produced an acid and an alkali. Mr. Henry, of Man- 

 chefter, faid he had decompofed ammonia and fixed alkali, 

 and had found that air was not a good conduftor of galva- 

 nifm. This is all the information that had reached us in 

 Germany through the medium of the French papers, and 

 particularly the Phylical Annals, publifhed by Gilbert. 



M. Ricliter, well known in Germany by his Beltrage %ur 

 kahern kentnifs der Galvamfmus, faw the firft notice of it in 

 the Bruflfels Journal, and had made the greater part of the 

 difcoveries above mentioned wheh he received it. The fol- 

 lowing is a brief account of what he had difcovered up to thd 

 30th of September 1800. 



Exp. 7. A zinc wire applied to the eye, and communi- 

 cating with a piece of fome other metal, touched by the 

 moiftened finger to form the gnlvanic chain, exhibits to the 

 eye looking towards the column a blue colour, which be- 

 -comes reddifli when the finger is removed. The eye muft 

 be a little accuftomed to this experiment before it can be 

 fully fenfible of the effe^l ; the phainomenon then becomes 

 conftant. 



Exp, II. A frog, gal van i fed in the ufual manner, which 

 at the end of half an hour exhibited no more movement, ftill 

 fhowed fome after five hours and a half when Volta's appra- 

 ratus was employed. 



Exp. III. Gold, the flame of a taper, heated glafs, ani 

 rarefied air, are conductors of galvanifm almoft in the fame 

 Jljianrter as they are of eIe<Sbricity : they cannot therefore b* 

 emplo}'ed to infulate. 



Exp. IF. When two metal wires are brought together iii 

 a glals tube, formed almoft as in the galvanometer of C, Ro- 

 bertfon^ no effe<Sl: is produced. Thfe cafe is the fame whert 

 removed too far from each other. See Plate V. fig, i. ~ 



Exp. V. Tin, lead, iron, copper, or bifmiith, placed at d 

 imd ^, exhibit different degrees of galvanic force proportioned 

 to the degrees of the oxydability of the bc^dies ehipldyed. 

 Mercury and filver produce the fame efre6ti Gold expferi- 

 ences no oxydatioij. 



Exp. 



