PHILOSOPHICAL 
TRAN SACTIONS. 
X. On Platina and native Palladium from Brasil. By William 
Hyde Wollaston, M. D. Sec. R. S. 
Read March 22, 1809. 
Although platina has now been known to mineralogists for 
more than sixty years, yet it had not been discovered in any 
other places than Choco and Santa Fe, whence it was origi- 
nally brought, until about two years since M. Vauquelin dis- 
covered it in some gray silver ores from Guadalcanal in 
Estremadura. In analysing these ores, he found some frag- 
ments that contained as much as one tenth of their weight of 
platina, but he did not find it accompanied by any of the new 
metals that have lately been discovered in the Peruvian ore 
of platina. 
The specimen which I am now about to describe, is derived 
from a third source, and it is rendered the more interesting 
by having grains of native palladium mixed with it. This 
new mineral has lately been received from the gold mines in 
Brasil, by H. E. Chev. de Souza Coutinho, ambassador from 
the court of Portugal, resident in this country, and I am in 
mdcccix. C c 
