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241 This extraci retains the purgative properties of the root, and the fibrous and earthy paris are separateil ; it may there- fore be employed alone for this purpose, but it will he found more especially useful as a basis for Pilis to whicli otheractive ingredients are to he adde l.
This Extraci has been much used in practice, to render thecommon decoctiori of the fame root stronger and more em cactous ; and it is now introduced sor the sanae purpose into the Pharmacopoeia.
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This Extrach has the considence of many practitioners iri Some Viscerat aflections, and is there re adopted. Pemberton on Diseases V Abdominat Viseera, p. 63
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MIXTURΕs depend upon the diffusion and suspension in any liquid os insolubie substances minutely divided, and forthis purpose, it is osten necessary that the liquid itself shouldbe rendered more dense by the addition of some viscid mat-
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Taho of Almond Confection, tWΟ ΟUnCOS. Distilled Water, a Pint. Add the water gradu atly to the Confection, rubbing them together, and Strain.
This will differ Dom the former lac amygdalae, only by the addition os a smali quantity of gum, Whicli preVenis more effectualty the separation of the oil on standing; and inorder to malae it smooth and uniform, it is necessary to use distilled Water. The present mode of preparation Dom theconfection is a considerable advantage in potnt of expedition, and has been practised in some shops for a sussicient time toestablish iis utility.
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Mistura camphorata, P. L. II 87. Iulepum e camPhora, P. L. 17 5.
I ahe of Camplior, half a dra Clim. Rectised Spirit, tela minim S. Water, a Pint. Firsi rub the camphor With the spirit, then villi the water gradu atly ad ded, and 8train the liqUor.
Many practitioners have been urgent that this mixtureshould be impregnated with a larger proportion os camplior; hut as in iis present state it is a grates ut preparation, and combines welt with other substances, of Whicli it is a common vehicle; as too, When it is intended to give camplior in large doses for iis more powerfui effecis, various methods OfeXtemporaneOUS prescription suggest themselves ; it has been determined to malae very litile change in the former directions. The division of the camphox by trituration, With alaw drops of spirit, facilitates the solution, and the water be- comes immediately and strongly impregnatev With iis sensibio qualities. Some practitioners are in the habit os preparing it by leaving a lump of camplior in a botile of Water, and POUring it oss as their use requires. Others add some viscid substance, as Sugar ; and this was done in the last Pharmacopoeia,
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hut has been now omitted, because Willi suci, addition the mixtore Will not keep so weli. Camplior dissolves perfectly in Water impregnated with carbonic acid. Os water, at oi di nary temperatures, one fluidounce does not dissolve morethan one grain and Sth of camphor.
Burni hartshorn consi sis entirely of phosphate of lime, whicli is insolubie in the preparation here directed ; it is onlybrought into the state os a very fine powger, and is hept mechanicatly suspended in a mucilaginous liquor, on Whichaccount, the gum is a use sui addition to the original formula in Bates's Pharmacopoeia, whicli contains none. It is re-tained as one of those establisbed forms whicli are in use Withmany practitioners.
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Mistura cretacea, P. L. 1787. Julepum e creta, P. L. 1745.
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tion, adii gradu ally, si St, the i OSC-Wnter undspirit os nutriaegs, and la St, the sulphate ofiron. Pour the mixture immedia toly into a proper glas S botile, and Sto p it close.
This celebrated and uses ut form of Dr. Gristitiis is noruintroduced for the purpose of giving precise directions for iis preparation, as being a comPOUnd Very commonly directed. The precipitation os subcarbonate of iron takes Place here, as in the directions giveri for that articie ; but that, on eXposure to the air as it drieS, attracis OXygen, and is converted into red oxyd; while this retains, ii properly prepared, iis state of black oxyd, whicli is diffused minutoly through thedense liquor, and asSisted in iis generat applications by the myrrh. The myrrh requires to be weli dried bes ore it canbe reduced to poWder.