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34 PYORRHOEA ALVEOLARIS. To the experienced and skillful operator success should at- tend the first operation in nearly every case; whenever this initial success is not realized, the operator may rest assured that either some particles of attached calculus remain, or that the cementum itself requires further scraping, or possibly that both deficiencies exist. The surgical operation must be repeated as often as neces- sary to attain completeness. As before suggested, the dentist may rely on the beneficent power of cocaine to carry his patient through the most pro- tracted operation incident to treatment of pyorrhoea alveolaris. DILUTE SULFURIC ACID. Water solutions of sulfuric acid are stable. Before enter- ing upon the surgical work described, the dentist should have at hand a solution of one part commercial sulfuric acid in ten parts of pure water ; or, if he desires to be exact, a five per cent, solution of C. P. sulfuric acid in distilled water. The surgical operation should be followed, within a few minutes, with an application of the dilute sulfuric acid, directly within the treated " pocket." As sulfuric acid is a severe irritant to raw surfaces, it is better to obviate pain by continuing the use of the cocaine solution once in the sanu manner, as at first. This will so obtund sensibility in the parts, that the acid will occasion no discomfort whatever to the patient. For applying the diluted sulfuric acid in this treatment, there probably is' nothing IWtcr than a syringe, as the prepa-