ON PALLADlt-M. 125 



Having botfed the oxide with pure alkalis, and found it to be The oxide is not 



iniakered, I thoaght the affinities of lime or lead might be ^^^-^.';'? ^^ '^;>''- 

 ' '^ r • /• ^"8 ^^"^ alkalis } 



more likely to deted the prefence of the phofphoric or of any 



known metallic acid j and accordingly I made various attemp'.s 

 by muriate and nitrate of lime, as well as by nitrate of !t;aa, to 

 eifaSt a decompohtion of the fuppofed compound. In the ex- 

 periment on which I placed the greatefl reliance, I poured 

 Jiquid muriate of lime into a folution of palladium in nitro- 

 muriatic acid, and evaporated the mixture to drynefs, intending 

 thereby to expel any excefs of acid that might have been left nor by pouring 



in the folution, and to render either phofphate of lime, or any J"""*'^^/^/ '."^^ 

 in- I II- -1 • /I Li • . „„•' into Its folution. 



compound ot lime with a melallic acid, mloluble m water. 1 he 



refiduum however was very readily ditToIved by water, and 



confifted merely of muriate of lime aad muriate of palladium> 



without any appearance of decom portion. 



When I found all my endeavours direfted to that end wholly Hence the difco- 



unfuccefiful, I no longer entertained any doubt of this fub- ^^'^^^ *^^ '^^'^' 



n t - /-I .1-1 1 i-rt , ranted in nub- 



Itance being a new fimple metal, and accordingly publilhed a iifhing it as a 

 concife delineation of its charader ; but by not direding the "£* na-tal. 

 attention of chemifts to the fubftance from which it had beeri 

 extradled, I referved to myfelf an opportunity of examining 

 more at leifure many anomalous phenomena, that had occurred 

 tome in the analyfis of platina, which I was at a lofs to explain, 

 until I bad learned to diftinguifli thofe peculiarities, that I 

 afterwards found to arife from the prefence of rhodium. 



§ VI. Additional Properties of Palladium. 



In my former Paper on that fubjed I alfo added fome obfer* Method of eafily 

 vations upon the properties and origin of palladium, defcribing (^P^'^^'''"^ P 

 only fuch.a mode of obtaining it from platina as (hould avoid 

 the introduction of any unneceflary ingredient which might 

 poffibly be mifinterpreted, and omitted one of the moft dif- 

 tinguiQiing properties of palladium, by means of which it may 

 be obtained with the utmoft facility by any one who pofletTes 

 a fufficient quantity of the ore of platina. 



To a folution of crude platina, whether rendered neutral by Pruffiateofmh-' 

 evaporation of redundant acid, or faturated by addition o^c^ry added to the 



n r r ■, -i.- ^i folution of crudi 



potaln, or loda, or ammonia, by lime or magnena, by mercury, ^/^ji^a, thro-wt 

 by copper, or by iron, and alfo whether the platina has or Jias^^""^'^^' /'«''* 

 not been precipitated from the folution by fal ammoniac, it isu'^utiT' * 

 merely neceffary to add a folution of pruffiate of merrury, for 

 Vol.XUI.'-'Februarv, 1805. L the 



