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clarified sugar to a strong blow, grain it (that is, turn it white byrubbing it against the sides of the pan) ; when it is white, and aboutthe thickness of cream, put it in well-oiled leaden moulds, and theseinto a stove till perfectly dry.Canella Cortex. L. E. D. P. Canella Bark, the bark of the wildcinnamon tree, Canella alba, which is sold in flat or quilled pieces,of a yellow colour, smelling like cloves, and of a warm, bitterish,pungent taste. Spirits are the best solvent, as water only extractsthe bitter without the aroma.

Medicinally it is carminative, tonic, astringent, stomachic, and aphro-disiac, and is given in dyspepsia, and atonic disorders in doses ofgr. x to 3j of the powder.Cantharides. L. E. D. P. Blistering Fly. Cantharis vesicatoria,Lytta and Meliie. O. This insect is a native of Spain. It is acri-monious to the taste, and fcetid to the smell.

Medicinally it is stimulant and diuretic. In doses of gr. j to gr. iv ofthe powder, in form of emulsion, twice a day, it is given in dropsy,urinary disorders, chronic blennorrhcea, leucorrhcea, suppression andincontinence of urine ; it is given combined with opium and cam-phor, in paralysis.

Externally it is rubefacient, vesicatory, and escharotic. When it isused to vesicate it sometimes produces strangury r , hematuria, andinflammation of the bladder and urethra, which ought to be treatedwith warm bathing, fomentations, and emollient drink.;.

Poisonous in large doses, such as are often given as an aphrodisiac, pro-ducing severe strangury, and pain in the bladder, priapism and bloodyurine, violent vomiting and retching, bloody stools, with furiousdelirium and horror of water, resembling hydrophobia.

Antidotes. Besides warm bathing, fomentations, and copious demulcentdrinks, bleeding largely will be requisite, and also opiates.

Test. The only test is the appearance of the shining specks ofthe flies, which cannot be detected if the tincture has been em-ployed, but when Cantharidin is better understood, a test may bediscovered.Cantharidin. New. The active principle of cantharides, procuredby Robiquet, in small plates of a micaceous lustre-, and crystallineform. A very small particle of this dissolved in sweet oil will pro-duce vesications on the skin in a few hours.Caoutchouc Varnish is made by taking 3-xvj each of elastic gum,boiled linseed oil, and spirit of turpentine, cutting with a wettedknife the caoutchouc into thin slips, liquefying them in a hot sand-bath, and while boiling add the linseed oil, and then the turpentine,also warm. When nearly cool strain through linen, and keep in a