AND ETHERS. OO

that of the fluid which distils over. This isbest accomplished by connecting one end ofthe tube with a graduated vessel eontainingthe spirit,—passing the othcr end through acork fitted into the mattrass,—and having astop-cock on the tube to regulate the discharge.When forty-two ounces have distillcd overand the whole spirit has been added, the pro-cess may be stopped. Agitate the impureether with sixteen fluidounces of a saturatedSolution of muriate of lime, eontaining abouthalf an ounee of lime recently slaked. Whenall odour of sulphurous aeid has been thusremoved, pour off the supernatant liquor, anddistil it with a very gentle heat so long asthe liquid which passes over has a densitynot above 735. More ether of the samestrength is then to be obtained from the So-lution of muriate of lime. From the resi-duum of both distillations a weaker ethermay be obtained in small quantity, whichmust be reetified by distilling it gently again.

Spiritus aethehis sulphurici.Take of Sulphuric ether, a pint.

Rectified-spirit, two pints.Mix them. The density of this preparatiönought to be 809.

SriRITUS AETHEHIS NITHICI.

Take of Rectified-spirit, two pints and sixfluidounces ;