GENERAL SYSTEMATIC BACTERIOLOGY 293 



Buchanan (1817, p, 612) included this as the third genus of the tribe 

 Streptococceae with the diagnosis: 



Parasites growing poorly or not at all on artificial media. Cells usually in 

 pairs, capsulated. Fermentative powers high, most strains forming acid in dex- 

 trose, lactose, saccharose and inulin. The cells are Gram-positive. 

 The type species is Diplococcus pneumoniae Weichselbaum. 



Winslow et al. (Committee Soc. Am. Bact., 1920, p. 206) describe 

 the genus as follows: 



Parasites, growing poorly, or not at all, on artificial media. Cells usually in 

 pairs of somewhat elongated cells, often capsulated, sometimes in chains. Gram 

 positive. Fermentative powers high, most strains forming acid in glucose, lac- 

 tose, sucrose and inulin. 

 Tj'pe species, D. pneumoniae Weichselbaum. 



Castellani and Chalmers (1919, p. 927) diagnose the genus as follows: 



Streptococceae usually in encapsulated pairs, forming acid in glucose, lactose, 

 saccharose, and inulin. Haemolysis usuallj' absent. Characteristic group serum 

 reactions. Soluble in bile salts. Undergo autolysis in cultures and in emulsions 

 of physiological saline. 



Bergey et al. (1923, p. 44) include this as the second genus of the 

 Streptococceae and follow the Committee's description. 



It would appear that Diplococcus Weichselbaum is a valid generic 

 name for the pneumococcus and the related form?, if they are worthy 

 of generic recognition. If the gonococcus and its relatives are to be 

 included in the same genus, the name Neisseria Trevisan should be 

 used. 



Diplokokken. Baumgarten (1890. p. 127) states: "1 Untergattung : 

 Diplokokken; die Zellen bleiben nach der Theiling z\i je zweien im 

 Zusammenhang." 



Diplokokkus. An aberrant form of spelling of Diplococcus used by 

 certain German authors, as Baumgarten (1890, p. 127), Klebs (1887, 

 p. 321). 



Diplopneumococcus. A casual name used by Krokiewicz (1904). 



Diplostreptococcus. A generic name used by Lingelsheim (1912, 

 p. 494) in a discussion of "Brustseuche der Pferde." He states, "Als 

 erreger hat man langere Zeit, den von Schiitz (1887, p. 27) zuerst ge- 

 fundenen Diplostreptococcus pleuropneumoniae der sich vielfach in den 

 Krankheitherden findet angesehen." This reference to Schiitz as an 

 authority' for this generic name is erroneous as a careful search of the 



