44 



I. The Prodigiosus group. 



A. Gelatin liquefied. 



1. No gas in dextrose, lactose, or saccharose. 



B. prod. VIII, B. amyloruber, B. fuchsinus. 



2. Gas in dextrose only. 

 B. prod. I, II, III. 



3. Gas in dextrose and saccharose only. 



B. prod. IV, VI, VII, B. ruber indicus I, II, 

 B. rutilus. 



4. Gas in dextrose, lactose and saccharose. 



B. prod. V, B. plymouth ensis, B. miniaceus, B. 

 kilien sis. 



B. Gelatin not liquefied. 



1. Gas in dextrose only. 

 B. ruber miquel. 



n. The Lactis erythrogenes group. 



The members of this group are characterized by the production 

 of soluble red pigment. The appended table shows also some inter- 

 mediary forms described by Dyar (loc. cit.). 



A culture from Krdl of B. ros e oflu or esc ens Tataroff, 

 which is said by Migula to be identical with B. lactis ery- 

 throgenes, was evidently atypical, showing thin white growth 

 and no pigment. It was non-motile, non-liquefying, and had no 

 effect upon milk. 



III. The Rubricus group. 



These cultures were of interest because they are typical forms 

 of a group of red chromogenic organisms quite different from the 

 Prodigiosus group. I have no doubt that the whole series of 

 small and non-motile, non-liquefying, slow growing red forms, i. e. 



