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42 PYORRHCEA ALVEOLAKIS. In closing this chapter the writer urges upon the operator to exercise perseverance, devote greatest possible pains to dis- covery and removal of every particle of calculus from the root, all loose and thickened pericementum, and thorough scraping of the cementum involved ; lastly, he must possess in- axhaustible patience and sympathy. Absolute success must attend every case, and this is possible; no partial success can be awarded any credit whatever—that has been the stopping place for a hundred years. Partial success is only modified failure, in treating pyorrhoea alveolaris.