The purpose of this paper is to report four cases in which the Bacillus aerogenes capsulatus was obtained in blood-culture during life, and to call attention to this means as a valuable method of diagnosis. Since the discovery of this organism there seems to have been no doubt that it invaded the general blood-stream at or shortly before death, as is evidenced by its generalized presence at necropsy in patients dying from this infection. Welch and Nuttall1 made this observation and called attention to it in their early report. Notwithstanding this report and the suggestion that it carried, only a few of the many observers of this organism have reported positive blood-cultures due to it, and so far as I have been able to find, there has been no recovery reported, when a positive culture was obtained.
In my series of four cases, three patients recovered and one died;