246 



JOHN T. MYERS 



B. dysenteriae never produced appreciable quantities in twenty- 

 four hours and only a few strains produced traces after a week's 

 incubation. The same distinction held for B. paratyphosus A 

 and B. paratyphosus B. B always forming hydrogen sulphide in 

 twenty-four hours or less and A forming practically none even 



TABLE 5 



Relative amount of hydrogen sulphide production by various strains of 

 B. paratyphosus A, and B. paratyphosus B 



ORGANISM 



B. paratyphosus 

 B. paratyphosus 

 B. paratyphosus 

 B. paratyphosus 

 B. paratyphosus 

 B. paratyphosus 

 B. paratyphosus 

 B. paratyphosus 

 B. paratyphosus 

 B. paratyphosus 

 B. paratyphosus 

 B. paratyphosus 

 B. paratyphosus 

 B. paratyphosus 

 B. paratyphosus 

 B. paratyphosus 

 B. paratyphosus 



B. 8.. 

 B. 12.. 

 B. 179 

 B. 101 

 B. 180 

 B. 323 

 B. 22. 

 B. 138 

 A. 3.. 

 A. 158 

 A. 9.. 

 A. 294 

 A. 16. 

 A. 322 

 A. 295 

 A. 10 . 

 A. 4.. 



30 

 30 



12 



25 



28 



30 



30 



30 



















1 





 

 

 



after a week's incubation. This property, combined with the 

 use of Endo and Russell's medium, should be of considerable 

 value in differentiating these organisms, especially when the 

 detection of carriers is the object in view. Ordinary broth is as 

 satisfactory for this purpose as any medium tried. Sterilization 

 in the autoclave instead of in the Arnold is satisfactory. 



