40 NEW METAL FOUND IN CRUDE PLATrNA,' 



pelled, by expofure to the extremity of the flame; and it be- 

 came fpongy and malleable, weighing in this ftate very nearly 

 five grains. 

 Palladium. (G 4-.) A portion of this metal was diffolved in ftrong nitrous 



acid, was precipitated by green fulphate of iron, and in other 

 refpecls, polfeffed all the properties afcribed to the palladium 

 offered for fale, in the printed paper that accompanied it, as 

 well as others fince noticed by Mr. Chenevix. 

 Its differences (G 5.) In its precipitation by pruffiate, it differs mod effen- 



from platina. tially from plalina ; and confequently is by no means difficult 

 to be diftinguifhed, or feparated from it. 



(G. 6.) The action of muriate of tin upon the folutions of 

 thefe metals, is alfo totally different. A dilute folution of pla- 

 tina, is thereby changed from a pale yellow to a tranfparent - 

 blood-red. A folution of palladium, on the contrary, ufually 

 becomes opaque, by the formation of a brown or black preci- 

 pitate; but, if mixed in fuch proportion as to remain tranfpa- 

 rent, it changes to a beautiful emerald-green. 



(G7.) In the formation of triple falls with the alkalis, as 

 obferved by Mr. Chenevix, palladium may be faid to refemble 

 platina; but the falts thus formed are far more foluble than 

 the correfponding falts of platina, and differ entirely, in the 

 colour and form of the cryftals. 



(G8.) The foda-muriate of palladium is a deliquefcent 

 fait; that of platina, on the contrary, forms permanent cry- 

 ftals. 



(G9.) The triple falts of platina, with either muriate of 

 ammonia or of potafh, form octaedral cryftals of a yellow 

 colour, that are very fparingly foluble in water. The corre- 

 fponding falts of palladium, likewife refemble each other in 

 every refpect. The cryftals are very foluble in water, but in- 

 folublein alcohol; their form is that of a four-fided prifm.and 

 they each prefent a curious contraff of colour, that certainly is 

 not obfervable in any known fait of platina. 

 Curious contraft (G 10.) Although the folution is of a deep red, the cryffal s 

 of colour in the are of a bright green when viewed tranfverfely. In thedirec- 



ff.tso p tion of their axes, however, the colour is the fame as that o 



dium. 



the folution; but, on account of its extreme intenfity, it is with 

 difficulty diftinguifhed in fragments that exceed -j-^ of an inch 

 in thicknefs. One confequence of this colour is neverthelefs 



v er.v 



