The observation of Buttle and his associates1that sulfanilamide protected and cured mice of an experimentally induced meningococcic septicemia has been amply confirmed by Proom,2Rosenthal and his associates,3Levaditi and Vaisman4and Brown.5Branham and Rosenthal3and Brown5concluded as a result of their observations on experimental meningococcic infections in mice that a combination of sulfanilamide with an effective antimeningococcus serum produced a greater protective or therapeutic effect than either of the agents by itself. Schwentker, Gelman and Long6in a preliminary report considered sulfanilamide to be as effective in the treatment of meningococcic infections in human beings as good specific antiserums. All of their eleven patients with but one exception were treated by both the parenteral and the intrathecal route. In this group of eleven patients there was but one death. Since this report was published, McIntosh and his co-workers,