70 
ECONOMIC GEOLOGY 
of Germany, France, and Spain, and along earth-movements 
of the same age in the Eastern Highlands of Australia. 
That platinum was raised in solution is suggested by the 
fact that the ultra-basic rocks in which it is found have 
been strongly altered, by its occurrence in various inter- 
mediate and sub-acid rocks, and with metallic sulphides in 
quartz-veins, The fact that the metals with which it is 
associated are mainly copper, gold, and chromium, in ad- 
dition to its own kin, such as osmium and iridium, indicates 
that the solutions which carried the platinum were of deep- 
seated origin.