ALKALI-rORMIlSrG BACTERIA FOUND IN MILK. 31 



Table 14. — Reduction of nitrates and nitrites in simple and coinplex media — Contd. 



Culture No. 



0.1 per 

 cent 

 pep- 

 tone, 



0.02 per 

 cent 



potas- 

 sium 



nitrate. 



Nitrite 

 test, 7 

 days. 



0.2 per cent beef 

 extract, 0.02 



per cent potas- 

 sium nitrate. 



Nitrite 

 test. 24 

 hours. 



Nitrite 

 test, 7 

 days. 



0.1 per cent bee [ 

 extract, 0.02 



per cent potas- 

 sium nitrate. 



Nitrite 

 test, 24 

 hours. 



Nitrite 

 test, 7 

 days. 



Sudium nitrate, 

 0.2 per cent; so- 

 dium-lactate, 

 0.25 per cent: 

 sodium-dibasic 

 phosphate, 0.1 

 per cent. 



Nilrite 

 test, 14 

 days. 



Change 

 in titra- 

 tion. 



Sodium nitrite, 

 0.2 per cent: so- 

 dium lactate, 

 0.25 per cent_; 

 sodium-dibasic 

 phosphate. 0.1 

 per cent. 



Ammo- 

 nia test, 

 14 days. 



Change 

 in titra- 

 tion. 



112 

 113 

 114 

 116 

 117 



lis 



119 

 120 

 121 

 122 



123 



124 

 126 

 126 

 128 



130 

 131 

 132 

 1.33 

 134 



135 

 136 

 137 

 138 

 139 



141 

 142 

 143 

 144 

 145 



146 

 147 

 303 

 309 

 314 



317 

 319 

 321 

 322 

 325 



326 

 340 

 353 

 354 



356 

 361 

 362 



- .95 



- .63 



- .92 



- .79 



- .97 



-1.07 



- .93 



- .85 



- .11 



- .07 



- .97 



- .87 

 -1 03 

 -1.01 



- .85 



-1.09 



- .97 



- .93 



- .05 



- .91 



-1.02 



- .97 



- .89 

 -1.15 

 -1.10 



- .95 

 -1.08 



- .76 

 -1.07 



- .97 



-1.05 

 

 

 



-1.19 







- .88 



- .75 



- .94 



- .90 



-1.00 

 



- .41 



- .84 



-1.10 



- .90 



- .18 



- .57 



- .40 



- .81 



- .99 



- .77 



-1.20 



- .86 



- .35 



- .06 

 -1.40 



- .63 



- .99 



- .96 



- .91 



- .62 



- .51 



- .87 



- .88 



- .63 

 -1.01 

 -1.33 



- .19 

 -1.45 



- .72 

 -1.01 

 -1.34 



-1.00 



-1.51 











-1.52 



- .51 



- .26 



- .72 



- .97 



.51 







.23 



.61 



.62 

 .18 

 .43 



It is interesting to compare the number of positive nitrite tests 

 in the peptone nitrate broth, where only seven cultures gave a 

 positive nitrite test after seven days, with the 0.2 per cent beef- 

 extract nitrate broth where 47 out of a total of 68 cultures showed 

 a nitrite test after seven days. Tins small number of reductions 



