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BY means of a method introduced by one of us (Wilson, 1907), a bacillus closely resembling B.faecalis alkaligenes was recently isolated from Belfast tap water. This bacillus, for the purposes of this paper, will be spoken of as B. Grosvenor, it having been attained from a house in Grosvenor Road. We find that emulsions of this bacillus are agglutinated, often in high dilutions, by the blood serum from practically every case of the cerebro-spinal meningitis at present existing in epidemic form in Belfast. That this epidemic is associated with Weichselbaum's Meningococcus we have pointed out in a former paper (22. vi. 1907). Briefly the characters of the B. Grosvenor are as follows:—an actively motile bacillus; Gram-negative; gelatin not liquefied ; no gas in glucose broth, nor with any other sugar or alcohol tested; milk not coagulated; very faint trace of indol in peptone water; neutral-red agar not fluorescent; Petruschky's litmus whey faintly alkalinised; Barsiekow's two media slightly alkalinised, then bleached, the blue returning on shaking; bluish colonies with faint reddish centre on Drigalski-Conradi plates; brown growth on potato, and abundant growth on agar. A fairly highly agglutinating anti-typhoid serum clumped the bacillus in dilutions of 1 in 50, but in no higher dilution, whereas the same serum readily clumped B. typhosus in 1 in 1000 dilution in 15 minutes.

Agglutination of Bacilli of the Alkaligenes, Colon and Typhoid Groups by the Blood Serum of Cases of Cerebro-Spinal Fever