Imitating Libman, who prefers the term subacute streptococcal endocarditis to that of subacute bacterial endocarditis when speaking of the more chronic viridans type of infection, I have ventured to make use of the title presented, in connection with a case of infective endocarditis of long duration. This I do the more readily, first, because the classic picture of subacute bacterial endocarditis was so faithfully reproduced over a course of many months; secondly, because the meningococci were the only organisms isolated in culture from the blood and spinal exudate, and, finally, because I had the further good fortune in the consideration of this case to be able to submit the history and specimens to Dr. Libman who, being more familiar with the occasional case of subacute bacterial endocarditis due to organisms other than Streptococcus viridans, was able to give me much necessary and useful information about these less common forms of