118

METALS

muriatic acid contained in any convenientvessel; when the whole apparatus is thusfilled with carbonic acid gas, secure the lastcork tightly ; and let the action go on tilinext morning, or tili gas is no longer absorbedby the salt. Remove the damp salt whichis formed, and dry it, either in the air with-out heat, orat a temperature not above 120°.

SODAE CARBONAS SICCATUM.

Heat any convenient quantity of Carbonateof Soda in a shallow vessel tili it is dry, thenurge it with a red heat in a crucible, and re-duce it to powder when cold.

SODAE MURIAS PURUM.

Take any convenient quantity of Muriateof Soda ; dissolve it in boiling water ; filterthe Solution: and boil it down over the fire,skimming off the crystals which form; washthe crystals quickly with cold water and drythem.

SODAE PHOSPHAS.

Take of Bones burnt to whiteness, tenpounds;Sulphuric acid, two pints, and four

fluidounces :

Carbonate of Soda, a sufficiency ;

Pulverize the bones and mix them with the

acid ; add gradually six pints of water; di-

gest for three days, replacing the water which