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PYORRHCEA ALVEOLARIS. " Dr. Clement certainly demonstrated clearly enough that the lacunae and canaliculi do become obstructed—even to obliter- ation—in the peripheral lamina when long bathed in pus in " pockets " of this lesion. It is well understood that the functional relation of perice- mentum to cementum is dependent upon canaliculi, conse- quently the complete obstruction of these little canals shuts off vital connection with pericementum and renders that membrane a useless covering to the solidified tract; under these conditions the membrane recedes toward the line of at- tachment. It certainly is doubtful that where once receded the pericementum may be reasserted entirely. It belongs to the future to disclose whether the conditions reported by Dr. Clement, and amply illustrated, are to be ac- cepted as constant facts or only accidental to a number of cases. Very much is dependent upon this proposition. In August, 1892, at Niagara Falls, N. Y., the writer re- ported a case in practice before the American Dental Associa- tion, by kindly permission of Dr. T. W. Brophy, Chairman of the Section on Oral Surgery and Pathology. In that re- port were given in detail the method and remedies resorted to successfully in a case of some nineteen " pockets," the result being a complete and surprisingly rapid cure of all. The permanency of cures in this case was not only a matter of grave doubt to some, but others actually disputed that there had been any cure whatever. The writer had the fortunate oppor- tunity to carefully examine this case thirteen months after the reading of the report, and of all the nineteen " pockets