Tin', eyanuret is employed in friction : it is either dissolved in distilled water, or made into an ointment with pure hog's lard, and used in either form, according to circum-Btahces. From one to four grains in an ounce of water, is the quantity usually employed for the aqueous solution : from two to four grains in an ounce of lard is the composition of the ointment. It may be mentioned that the aqueous solution is in general of the two forms the more prompt and insiantaneous in its effects.

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... se I.-Facial Neuralgia instantaneously cured by the Hydrocyanatc of Potash in Friction. A lady, of robust habit, 49 years of age, was a martyr to the most agonizing occasional attacks of pain in the space, between the temporal region and the ciliary arch and the maxilla. She used to scream violently in these torturing accessions, and sometimes lost all appearance of sensibility to such a degree that she has been supposed to lie struck with apoplexy. Pulse 84 ; face rather flushed ; no functional derangement. She was ordered to be rubbed with the aqueous solution, containing sixteen grains of eyanuret of potassium in four ounces of distilled water : il was rubbed on the forehead and cheek with a ball of cotton. The pain gave way almost instantaneously at the very first application ; and seemed, as the patient said, to be rubbed away with the hand. A complete cure was effected by persevering a little while in the use of the remedy. Case II. -Periodic Neuralgia removed by the Ointment of the Cyinmrct. The cure in this instance was less prompt, but not less certain. A lady, 38 years of age, experienced the severest pains in the temporal region and upper jaw of the left side : they came on regularly every morning at four o'clock ; went on increasing in severity until about ten, and did not cease till four in the afternoon. In that interval she labored under anorexia, fever, headach, &c, and was almost driven distracted. She was bled to twelve ounces to relieve congestion, and then the ointment was applied to the cheek and temple. Two grains to the half ounce of lard were at first employed, but the improvement was more rapid under the application of ten grains to two ounces. Lotions of the eyanuret were eventually used, and the cure was complete. Case 111.-Facial Neuralgia almost, immediately cured. A lady, 20 years of age, suffered for several days, at the same hour, the most torturing pains in the orbital and supramaxillary regions. Her face was much flushed, particularly on the affected side. Ten grains of the eyanuret were dissolved in four ounces of the distilled water, and rubbed on with cotton. The application was quite successful. Case IV. -Chronic Occasional Neuralgia similarly treated. A woman, of 80, who had long suffered from irregular attacks of this complaint, was cured by lotions and frictions, compounded pretty strongly, and continued for some time.