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40 PYORRHEA ALVEOLARI8. " ets" that have just been treated; but the " pockets" will be there until nature can fill them in with new bony structure, which requires time. The case, meanwhile, must be kept clean by weekly or fortnightly attention, washing out the " pockets " with the hot water in forcible currents, and treating them with injections of some acid astringent preference may advan- ; tageously be given to strong solutions of chloride of aluminum, or, better still, the standard preparation known as bromo- chloralum—which is sold by nearly all druggists. The chloride of aluminum (common alum) or the bromo- i chloralum should not be used at the same sitting with nitrate of silver, owing to the facility with which a chloride of silver may be formed by such combination in the mouth. This chloride of silver has a light or whitish color, and clings to a tooth-root more tenaciously than even the calculus, and posi- tively will not scale off, but must be scraped to the last bit. If possibly there are evidences of pus in a treated " pocket at the third sitting, the dentist may rest assured that the surgical operation must be repeated, and extra care taken to make it complete and final, if possible. Instead of such an unfortunate coincidence being discouraging, it should stimulate to better effort and a determination to conquer success. The operator will be gratified and fortified by having his patient to return once or twice a month for a couple of months, as these occasions for examination will afford assurance of ab- solute successful cure, and to warn the patient as to unclean- liness about the teeth.