_Black tooth-powder._--Finely pulverized linden charcoal 2 lbs., precipitated carbonate of calcium 1 lb., best soap-powder 3½ ozs., peppermint oil 1¾ ozs., clove oil 8¼ drachms, guaiacum tincture 3½ ozs. Proceed as given for thymol tooth-powder. _Poudre de corail._--Carbonate of magnesium 1 lb., sugar of milk 7 ozs., prepared chalk 1 lb., best soap-powder 7 ozs., alizarin 3½ ozs., peppermint oil 1¾ ozs., clove oil 5½ drachms, cassia oil 2¾ drachms. Proceed as given for thymol tooth-powder. _Camphor tooth-powder._--Prepared chalk and precipitated carbonate of calcium each 1 lb., best soap-powder 2½ ozs., peppermint oil 5½ drachms, camphor 1 oz. dissolved in the necessary quantity of alcohol of best quality. Thoroughly mix all the ingredients and pass the mixture through a fine sieve. This tooth-powder should be used only every 5 or 6 days; when too frequently used it affects the nerves. _Opiat liquide pour les dents._--Genuine honey 1½ lbs., sugar syrup 2½ ozs., best wheat flour 7 ozs., round-lake 2 ozs., peppermint oil and clove oil each 11¼ drachms. Convert the round-lake into a fine powder and pass it through a fine sieve into a capacious porcelain dish. Then intimately mix it with the wheat flour, gradually add the honey and syrup, and after thoroughly working the mass for about ¼ hour, add the volatile oil. Now work the whole thoroughly with the pestle, then cover the dish, and after allowing it to stand quietly for about 36 hours, bring the mass into boxes of glass or tin provided with screw-tops. _Poudre d' Algérine._--Cream of tartar and pulverized red coral each 2 lbs., pulverized burnt alum 1 lb., pulverized sugar of milk 2 lbs., cochineal as coloring matter 3½ ozs. The pulverized ingredients are brought into an enamelled vessel having a capacity of 12 quarts and thoroughly mixed, so that the cochineal is uniformly distributed in the mass. Now have ready about 3 quarts of nearly boiling water and a thoroughly cleansed soap-stirrer or similar instrument.