as a Branch of Natural History , ^c, 259 



is attracted by the magnet. Soluble iii acids without effervescence Scratch 

 talc. 



Gen, Humboldtite, or oxalate of iron. 



Order XVI.— HYDRATEOUS. 



Chem. Nat. — Hydrates. 



With the blowpipe in the matrass giving out water and becoming opake ; 

 soluble in borax and salt of phosphorus into a transparent glass ; not soluble 

 in soda ; entirely soluble, without effervescence, in acids. Scratched by cal- 

 careous spar ; slightly flexible with elasticity. 



Gen. — Hydrate of magnesia. 



DIVISION II.— HYDROLYSIMOUS CRYSTALS. 



Sensibly soluble in water, sapid, harder and not less brittle than rock-salt 

 and alum ; generally light. 



Order I.— CARBONAQUEOUS. 



Chem. JVaA— Carbonates. 



Effervescing with acids. 



G^».— Natron, or carbonate of soda. 



Order II.— NITRAQUEOUS. 



Chem. Nat — Nitrates. 



Detonating on live charcoal. 



Gen.— Nitrate of lime ; nitrate of soda ; nitrate of potassa, or nitre. 



Order III.— BORAQUEOUS. 



Chem. Nat — Borates. 



With the blowpipe fused on charcoal, in a mixture of 4| parts of bisulphate 

 of potassa, and 1 part of fluate of lime, giving a bright green colour to the 

 flame. 



Gen — Borate of soda, or borax. 



Order IV.— MURIAQUEOUS. 



Chem. iVaf.— Chlorides, or muriates. 



With the blowpipe, fused in a mixture of salt of phosphorus and deutoxide 

 of copper, giving a green colour to the flame. 



Ge/i.— Salmiac, or muriate of ammonia ; rock-salt or muriate of soda, or 

 chloride of sodium. 



Appendix. — Cotunnia ? or muriate of lead ? .Monticelli and Covelli. 



Order V— VITRIOLS. 



Chem. Nat. — Sulphates. 



With the blowpipe giving a brawn colour to a glass of silica and soda. 



Gen. — Sulphate of soda ; Mascagnine, or sulphate of ammonia ; alum ; 

 sulphate of potassa ; Reussine ; Epsomite, or sulphate of magnesia ; sulphate 

 of iron ; sulphate of copper ; Gallizinite, or sulphate of zinc ; sulphate of 

 cobalt ; sulphate of uranium ; sulphate of manganese ; sulphate of nickel 



