ABSTRACTS 681 



on B. coll being better when the temperature of the water was below 

 23°C. But filtration alone was found insufficient to maintain a sani- 

 tary condition, and continuous disinfection with copper sulfate is 

 recommended. The chemical should be added, at the rate of 1 part 

 per million, three times per week, preferably just before the pool is 

 opened. This method, together with an occasional sterilization with 

 calcium hypochlorite keeps the pool in good sanitary condition for 

 several months. — P. B. H. 



CLASSIFICATION OF BACTERIA 



Studies on the Paratyphoid-enteritidis Group. C. Krumwiede, Jr., 

 J. S. Pratt and L. A. Kohn. Jour. Med. Res., 1916, 34, 355-358, 

 In a study of a series of cultures of the pathogenic types of the 

 paratyphoid-enteritidis group the authors found that xylose was fer- 

 mented by all of the types except paratyphoid A, and suggest this as 

 a presumptive test for this group. — H. W. T. 



A Study of the Grouping of the Meningococcus Strains. Miriam P. 



Olmstead, Phoebe L. DuBois, Josephine B. Neal, and Rose 



Schweitzer. Collected Studies, Bureau of Laboratories, New 



York City, 1914-1915, 8, 180. 



By means of complement fixation the meningococcus may be clearly 

 differentiated from aUied organisms. A differentiation of individual 

 meningococcus strains is possible by use of refined technique, but the 

 relationship of strains is so close that it is difficult to obtain abso- 

 lutely clear-cut and consistent results. Of the 29 strains studied, 14 

 seem to form one group and 8 another. Three are related to the first 

 group but have acted so irregularly that they cannot be classed with 

 it; 2 have shown a relationship with each other only and 2 have shown 

 a relationship to no other strain. — T. G. H. 



A Study of Gas-Production by Different Sti-ains of Bacillus abortivo- 

 equinus. E. S. Good and S. S. Corbett. Jour. Infect. Diseases, 

 1916, 18, 586-595. 



It was ascertained that this organism produced approximately 2 

 per cent gas in lactose in 80 per cent of 116 trials; and slightly less 

 than 2 per cent in sucrose in 50 per cent of 56 trials. Comparisons with 

 the fermentation power of related organisms cause the authors to 

 conclude that lactose and sucrose can be employed to advantage in 

 differentiating B. abortivo-equinus from the colon bacillus, while dul- 

 cite can be used to differentiate it from the members of Subgroup II 

 of the colon-typhoid group, although absolute proof must depend upon 

 other characteristics. — P. B. H. 



