PALLADIUM, CADMJUM, TELLURIUM, 



PALLADIUM. 



This metal was discovered by Dr. Wollaston, 

 who found it in the ore of platina. Its colour is 

 of a duller white than platina ; it is malleable and 

 ductile, and for fusion it requires g, stronger heat 

 than for gold. Jt is rather harder than iron. 



It unitps with sulphur, and is acted on by the 

 acids, but most readily by the nitro-muriatic. 



It forms alloys with other metals, that with 

 gold has been usefully employed in astronomical 

 instruments, as it is hard* and does not tarnish. 



CADMIUM. 



This metal was discovered by M. Stromeyer, in 

 1817, in ores of zinc, particularly in brown fibrous 

 blende. It resembles tin, but is rather more fusi- 

 ble. It does not tarnish in the air. 



It readily disolves in acids* but its salts are lit- 

 tle known. It is a rare metal, and not applied to 

 any use. 



TELLURIUM. 



This metal was discovered by Muller in 1782. 

 It is of a bluish white colour, of considerable bril- 

 liancy. It is extremely brittle ; melts in a heat a 

 little greater than that required for lead. It is so 

 volatile that it may be distilled, like mercury. 



Its qxide has acid properties. It is formed by 

 burning the metal ; a white smoke is disengaged, 

 which is the oxide. It may be also obtained by 



