ie! se Para 
W. Gibbs on the Platinum Metals. om 67 sd 
vious conversion of the platinum-metals into sulphids and subse- 
quent reduction to the metallic a is upon the whole more in- 
convenient and requires more time than the —— resolution of 
the ore by fusion with an on ei mixtur 
Experiments which I have instituted upon a effects of fasing 
the ore with steel, phosphorus, arsenic and sodium to 
really valuable practical results. It is true that an ‘alloy vidle 4 
steel can be obtained by fusion at a high temperature. Acids 
slowly dissolve the iron in this alloy and leave the platinum me- 
tals in the form of a black powder which is attacked by nitro- 
muriatic acid, though not completely oe But the process 
is tedious and the results not very satisfacto 
ohler’st method of resolving iiekacliiees consists in passin 
moist chlorine over the ore mixed with common salt and heated 
to low redness in a glass or porcelain tube. This method is in- 
moreover less expensive ind can be carried ont with smaller. 
vessels. 
Claus’§ method of resolving the ore consists in fusing for an 
hour, at a red heat, a mixture of one part of ore with one = 
. 
* Since the above was written the eam memoir of Deville and 
the platinum metals has appeared he eee et de Bit bo , 3d, Ty 
I have not however init seo to re be per ocesses for su ae: 
izin, ng osmiridium given i bat st Ae it prcbaitie “that | the subdi- 
vf the o ga be simpler than that same 
I yaee ie above. 
es. ry _ nnalen, xxxi, 1 
ournal far prakt © Chen: xxxvii, p. 483. 
§ Beitriige zur Uhemie der Platio-metalle. Dorpat, 1854. 
