296 



A MANUAL OF BACTERIOLOGY 



negative and grows on gelatin, may also occur in the nasopharynx 

 (Arkwright, loc. cit.). 



The following table summarises the fermentation reactions : 



4- = acid. = no change. The figures indicate the days on which the 

 change occurs (after Gaskell). 



Still observed in simple posterior basic meningitis of infants a 

 diplococcus closely resembling the meningococcus, but growing 

 more freely on agar, etc. By some it is regarded as an attenuated 

 form of the latter. According to Arkwright it does not liquefy 

 gelatin, and grows on this medium at 22 C., fails to produce acid 

 from glucose, maltose, and galactose, and is not agglutinated by a 

 meningococcus serum. It is in these respects very like the M. 

 cinereus of Lingelsheim. Wollstein 1 failed to find any reliable 

 criteria of difference between strains of the D. intracellularis and 

 several cultures obtained from cases of posterior basic meningitis. 

 Houston and Kankin 2 found that ten Gram -negative cocci isolated 

 from cases of sporadic cerebro -spinal meningitis differed from the 

 D. intracellularis in respect of their opsonins and agglutinins, 

 though eight of them were identical with the meningococcus in 

 fermentative power. 



LITERATURE ON THE MENINGOCOCCUS. Gordon, Rep. Loc. Gov. 

 Board, 1907 (Bibliog.) ; Arkwright, Journ. of Hygiene, vol. vii, 

 1907, p. 193, and vol. ix, 1909, p. 104 ; ibid., vol. xv, 1916, pp. 405, 

 446, and 464 (Eastwood, Griffith, Scott) ; Medical Eesearch Com- 

 mittee, Hep. of the Special Advisory Committee upon Bacteriolo- 

 gical Studies of Cerebro -Spinal Fever during the Epidemic of 1915, 

 and Bacteriological Studies in the Pathology and Preventive Con- 

 trol of Cerebro- Spinal Fever (Special Report Series, No. 3) ; 



1 Studies from the Rockefeller Inst., vol. x, 1910, No. 13 



2 Brit. Mfd. Journ., 1907, vol. ii, p. 1414. 



