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w PYORRHCEA ALVEOLARIS — treated there was not one in which there was any evidence; of recurrence of the disease. A letter received within two months from this patient (who resides in a distant State), gives assur- ance that there still is no reappearance ot pyorrhoea alveolaris after more than twenty months. That there has been a cure, and a permanent cure in this case, would appear assured. This system was also given in detail by the writer at the recent Dental Congress at Chicago (1893). Section IV. (See reports in Dental Cosmos). As early as the summer of 1891 the writer was enabled to cure a number of cases, which are still free of the disease, but was not successful in establishing a definite system by which uniformly good results were attainable until in July, 1892, the experiments culminated in the case reported at Niagara Falls in August of that year ; from that time to this date the same system has been pursued w ith a long succession of cases r many being desperately bad— T ith no failures whatever re- ported. Nearly every case treated has been under surveillance and subjected to monthly inspections. SOME PROPOSITIONS. It may be stated as a general proposition, that wherever a tooth retains good attachment upon one or more sides of its root, it may safely be classed as curable, without regard to looseness or the condition of the pulp. The conservation of pulps in pyorrhoea alveolaris is depend- ent entirely upon the demands or convenience of the case in hand, according to the judgment of the operator in charge.