METALS. Ill 



8. Didym'ium. — A metal found with cerium in certain 

 minerals. 



9. Tho'rium. — Tlie metallic base of thorina. It is of a 

 gra3'ish color. 



ZIXC CLASS. 



1. Magne'sium. — The metallic base of magnesia. It is a 

 white, lustrous, malleable metal, which fuses at a red heat 

 and oxidizes in hot water. 



2. Zinc. — A metal of a brilliant white color, with a shade 

 of blue, and appearing as if composed of plates adhering 

 together. It is not brittle, but is less malleable than cop- 

 per, lead, or tin. It is procured either from calamine^ 

 the native carbonate, or from hlendeA\\.Q native sulphuret. 



3. Cadmium. — A ductile and malleable white metal, which 

 is like tin, but fuses and volatilizes at a lower temperature 

 than that at which tin melts. 



lEON CLASS. 



1. Co'balt. — x\ metal of a reddish-gray or grayish-white 

 color, very brittle, and easily reducible to powder. It is 

 never found in a pure state, but usually as an oxide, or 

 combined with arsenic or its acid, with sulphur, iron, etc. 



2. Nick'el. — A metal of a white or reddish-white color, of 

 great hardness, very difficult to be purified, always mag- 

 netic, and, when perfectly pure, malleable and ductile. It 

 is generally obtained from its sulphuret. 



3. Ura'nium. — A metal discovered in tlie minerals called 

 pechblende and uranite. It is either a black coherent 

 powder or a white malleable metal, according to the state 

 of aggregation. 



4. Iron. — A metal of a peculiar gray color, and very bright 

 when polished ; it is not very malleable, but is extremely 

 ductile and tenacious. It is attracted by the magnet. It 

 has been found native only in bodies of meteoric origin. 



5. Chro'mium. — A metal consisting of a porous mass of 

 agglutinated grains, very hard, brittle, and of a grayish- 

 white color. 



6. Man'ganese. — A metal of grayish-white color, and of 

 considerable brilliancy ; it has neither taste nor smell, is 

 of the hardness of iron, very brittle, and, when reduced 

 to powder, is attracted by the magnet. 



