IT IS extremely gratifying for the medical profession to witness progress in therapy, especially when it applies to ailments that were formerly fatal. To the diseases of this kind, such as diabetes, pernicious anemia, Addison's disease and various forms of bacterial meningitis, which in the past almost always resulted in death it may soon be possible to add some types of bacterial endocarditis. Among the common diseases of the heart, none has been so resistant to treatment and so invariably fatal as subacute bacterial endocarditis. Although isolated cures occurred before the introduction of the sulfonamides, there is little evidence that . . .