74

CENT

in London for facing houses, and for the foundations of largeedifices.

Roman Cement is made by mixing a barrel of lime slaked, with Ibiijssof sulphate of iron, 15 gallons of water, and half a bushel of finegravel sand. The copperas should be dissolved in hot water; itmust be stirred with a stick, and kept stirring continually whilein use.

Genuine Roman Cement, consists of the Pulvis Buteolanus, or Puz-zolanum, a ferruginous clay from Puteoli, calcined by the fires ofVesuvius,—lime, and sand, mixed up with soft water. The onlypreparation which the Puzzolanum undergoes is that of poundingand sifting; but the ingredients are occasionally mixed up withbullocks' blood, and fat of animals, to give the composition moretenacity.

Turners' Cement, used by turners and other artizans, is made bypowdering and heating to redness lG parts of whiting, and whencold, mixing it with 16 parts of black resin, and one part of bees'wax, previously melted together, and stirring the whole into apaste.

Water Cement is prepared by mixing together and moistening withlime water lb5G of coarse sand, 1642 of fine sand, and then addingto the mass ibl4 of pure fresh-burnt lime, and while beating themup together gradually adding lb 14 of bone ashes. The quicker themixing is done the better.

Williams's and Wyclis Cement. See Stucco.

Wire Cement, for pasting paper on wire, and used by confectioners, ismade by mixing hair-powder with thick soaked gum arabic into apaste of the thickness of cream.CentauiiejE Benedicts Herba. E. The Blessed Thistle, Cnicusbenedictus. D. P. An herb which has been long famous as a diuretic,antacid, stomachic, and bitter tonic, and in larger doses of the infu-sion slightly emetic. Given in doses of gr. xv to 5j of the powderedleaves every three hours, or gij of the infusion, made by steeping5yj in a pint of cold water, in dyspepsia, visceral obstructions, &c.It is also a good diaphoretic in rheumatism, &c, by provoking copioussweats. It is now little used.Centaukii Cacumina. L. Flowering tops of the Lesser Centaury.Chironia centaurium. E. or Erythrcea centaurium. D. P. It is anintense bitter, and is one of the ingredients in the Portland powderfor gout.Medicinally it is tonic, diaphoretic, and stomachic, in doses of 3j to 5jthrice a day, or gij of the infusion made from 3J to a pint of boilingwater.