SUBSTITUTION OF BROM-TUYMOL-BLUE FOE LITMUS 



303 



TABLE 2 



The inflxience of brom-thymol-blue upon acid production by Bacl. typhoaum, 



using media and dilutions as in table 1 



One series of the tubes was inoculated with 0.1 cubic centi- 

 meter of an eighteen-hour culture of Bad. coli-comviunis; the 

 second set was inoculated with the same amount of Bact. typho- 

 sum; the third with Staphylococcus albus; the fourth with Bacillus 

 subtilis; and the fifth series was left as a check. All five sets of 

 tubes were incubated at 37°C. 



The data in the tables show that brom-thymol-blue did not 

 have a marked effect of inhibition on the acid production by the 

 Gram negative Bact. coli-communis or Bact. typhosum and 

 inhibited the two Gram positive organisms only in concentrations 



TABLE 3 



The influence of brom-thymol-blue upon acid production by Staphylococcus albus, 

 using media and dilutions as in table 1 



