BACTERIAL NUTRITION 



377 



TABLE 7 

 Showing the utilization of Eimer and Amend peptone 



ORGANISMS 



Control 



Subtilis group, 3 members 



B. prodigiosus 



P. vulgaris, 2 strains 



P. mirabilis 



Staph, aureus and albus, 4 strains... 



B. cloacae 



B. typhi, and B. paratyphi A and B. 



B. coli, 4 strains 



B. diphtheriae, 2 strains 



20.0 

 6.0 

 2.0 

 7.0 



14.0 



12.0 

 8.0 

 7.0 

 8.0 



10.0 



SORBNSEN 

 TEST 



24.0 

 49.0 

 48.0 

 42.0 

 42.0 

 38.0 

 38.0 

 35.0 

 37.5 

 39.0 



BIURET TEST 



1.0 



0.0 



0.0 



0.0 



0.3 



0.48 



0.4 



0.45 



0.43 



0.43 



Medium: 0.5 pe • cent peptone, 0.25 per cent beef extract, 0.5 per cent NaCl. 

 Incubation at 30°C. for three weeks. 



TABLE 8 

 Showing the utilization of "aminoids" of Arlington Chemical Company 



ORGANISMS 



Control 



Subtilis group, average 3 members. . 



B. prodigiosus 



P. vulgaris, 2 strains 



P. mirabilis 



Staph, aureus, 3 strains 



Staph, albus 



B. cloacae 



B. typhi, and B. paratyphi A and B. 



B. coli, 4 strains 



B. diphtheriae 



20.0 



4.0 

 4.0 

 3.0 



12.0 

 9.0 



10.0 

 4.0 

 2.5 

 1.0 

 9.0 



SORENSEN 

 TEST 



42.0 

 57.0 

 54.0 

 46.0 

 64.0 

 59.0 

 64.0 

 46.0 

 56.0 

 51.0 

 52.0 



BIURET TEST 



1.0 



0.0 



0.0 



0.0 



0.0 



0.3 



0.3 



0.25 



0.3 



0.35 



0.2 



Medium : 0.5 per cent aminoids, 0.25 per cent beef extract, 0.5 per cent NaCl 

 Incubation at 30°C. for three weeks. 



THE UTILIZATION OP PURIFIED PROTEOSE 



Proteose was obtained from commercial ''peptone" by salt- 

 ing out with ammonium sulphate. The first precipitate was 

 dissolved in water and the proteose reprecipitated with the 

 sulphate. After dialysis for several days the proteose solution 

 was converted into a test medium by the addition of Liebig's 



