rilKTENDtD NEW METAL; PALLADIUM, g7 



Theeffedsof galvanic eleflricity Upon palladium, were tlie Galvanic cfFefts, 

 fame as upon gold and filver. No oxidizement of the fubftance ^s &'^^<^ «' filver. 

 took place ; but oxigen gas was emitted ; during the whole 

 Jtime it formed a part of the galvanic circle in action, 



A lamina of this fubftance being expofed to the blowpipe, Became blue 

 the fide removed from the immediate aciion of the flame ba- '^"^ ^^^' 

 came blue; but the temperature at which this colour was 

 produced, exceeded that at which (leel begins to lofe the 

 tinge it had received at a lower heat. 



I expofed palladium, in an open vefTel, to a greater degree No oxidizement 

 of heat than that which can melt ffold. No oxidizement ^>' ?''^"S Heat. 



° Fuhon more 



eniued ; and, although the metallic flip was extremely thin, difficult than 

 no appearance of fufion took place, even at the edges or ^^at of gold, 

 corners. Upon increaiing the fire confiderably, I obtained 

 a melted button ; but I cannot ertiraate the degree at which 

 the fufion was efTeded. 



The button, by this treatment, had lofl a h'ttleof its abfolute F«fed button 

 iV^eight ; but its fpecific gravity had increafed from 10,972 to more^dcnfe^^'^* 

 ; 1 1,^7 1. It was of a grayifti-white. Its hardnefs was rather harder than iron, 

 fuperior to that of wrought iron. By the file, it acquired the ^,re'fibrouf ^'^" 

 colour and brilliancy of platina. It was malleable to a great cryftallized. 

 degree. Its fra^lure was fibrous, and in diverging ftriac, which 

 feeraed to be compofed of cryflals; the furface of the button 

 alfo, when feen through a lens, appeared to be cryflallized. 



Palladium very readily combines with fulphur. I expofed Combines and 

 .a certain quantity of it to a violent heat, without being able fu*i^^u7bv i°nl- 

 •to melt it ; and^ at that elevated temperature, threw fome tion. Suiphuret 

 Xulphur upon it. It immediately entered into fufion, and ^^^^''j" ^"'^ ^'"^ 

 lemained in that fiate until the rednefs of the crucible was 

 hardly vilible in the daylight. The increafe of weight in the 

 button of the fulphuret, was fuch as could not indicate with 

 exadlnefs the proportion of fulphur combined with it ; and I 

 was fo limited in the quantity of palladium I could obtain on 

 uny terms, that I thought it prudent to referve as much as 

 po0ible for the inveftigation of more important properties. 

 Suiphuret of palladium is rather whiter than the fubfiance itfelf, 

 and is extremely brittle. 



Palladium, melted in a charcoal crucible, and kept in fufion Continued 

 /or fifteen minutes, did not acquire any properties different ^?^°".^^P^'*" 

 fxQOi thofe which I have already mentioned, infpeaking of the coal j no change. 



effea 



