577. _Pearl White._--Bismuth dissolved in aqua-fortis, is pearl white. This, though at first it whitens, afterwards blackens the skin, as all preparations from lead do; and therefore none of them are safely to be used.--_Dr. Moyes' Lectures._ 578. _Pot-pourri._--Put into a large china jar the following ingredients in layers, with bay-salt strewed between the layers: two pecks of damask roses, part in buds and part blown; violets, orange-flowers, and jessamine, a handful of each; orris-root sliced, benjamin and storax, two ounces of each; quarter of an ounce of musk; quarter of a pound of angelica root, sliced; a quart of the red parts of clove-gillyflowers; two handfuls of lavender flowers; half a handful of rosemary flowers; bay and laurel leaves, half a handful of each; three Seville oranges, stuck as full of cloves as possible, dried in a cool oven, and pounded; half a handful of knotted marjoram; and two handfuls of balm of Gilead, dried. Cover all quite close. When the pot is uncovered the perfume is very fine. 579. _A quicker sort of sweet Pot-pourri._--Take three handfuls of orange-flowers, three of clove-gillyflowers, three of damask roses, one of knotted marjoram, one of lemon-thyme, six bay-leaves, a handful of rosemary, one of myrtle, half of mint, one of lavender, the rind of a lemon, and a quarter of an ounce of cloves. Chop all, and put them in layers, with pounded bay-salt between, up to the tip of the jar. If all the ingredients cannot be obtained at once, put them in as you get them; always throwing in salt with every new article. 580. _Hungary Water._--Mix one quart of spirits of wine; half a pint of water; and three-quarters of an ounce of oil of rosemary. 581. _Lavender Water._--Mix in a quart bottle three drachms of oil of lavender; one pint rectified spirit of wine; shake them well together, and add an ounce of orange-flower water, an ounce of rose-water, four ounces of distilled water, and, if you like, two or three drachms of essence of musk. 582. _Rose-water._--When the roses are in full bloom pick the leaves carefully off, and to every quart of water put a peck of them; put them in a cold still over a slow fire, and distil gradually; then bottle the water; let it stand in the bottle three days, and then cork it close. 583. _Another._--Take two pounds of rose leaves, place them on a napkin tied round the edges of a basin filled with hot water, and put a dish of cold water upon the leaves; keep the bottom water hot, and change the water at top as soon as it begins to grow warm. By this kind of distillation you will extract a great quantity of the essential oil of the roses by a process which cannot be expensive, and will prove very beneficial.