Vol. 6, 1920 
ZOOLOGY: R. W. GLASER 
273 
organisms were selected. Witte's peptone media, containing various 
molecular concentrations of NaNOs and KNO3, were prepared. These 
media were inoculated with equal amounts of 48-hour cultures of the bac- 
Table Showing Results of the Nitrate-Nitrite Reduction Tests 
Code: A plus sign indicates reduction of nitrates to nitrites 
A cipher indicates the lack of such reduction 
WG indicates a weak growth. NG indicates no growth 
SPECIES OP 
.0002 
.0005 
.0008 
.001 
.01 
.1 
.5 
1 
2 
4 
ORGANISM 
M 
M 
M 
M 
M 
M 
M 
M 
M 
M 
W.G. 
W.G. 
N.G. 

N.G. 
Spirillum 
NaNOs 
0 
+ 
+ 
+ 
+ 
+ 
0 
0 
0 
0 
metchitikovi 
KNO3 
0 
+ 
+ 
+ 
+ 
0 
0 
0 
0 
W.G. 
W.G. 
N.G. 
N.G. 
N.G. 
N.G. 
Bacillus 
NaNOs 
0 
0 
+ 
+ 
+ 
+ 
+ 
0 
0 
prodigiosus 
KNO3 
0 
0 
+ 
+ 
+ 
+ 
+ 
+ 
0 
0 
N.G. 
N.G. 
W.G. 
W.G. 
W.G. 
N.G. 
Bacillus coli 
NaNOs 
0 
0 
0 
0 
+ 
+ 
+ 
0 
0 
0 
communis 
KNO3 
0 
0 
0 
0 
+ 
+ 
+ 
0 
0 
0 
W.G. 
W.G. 
N.G. 
W.G. 
N.G. 
Coccohacillus acridi- 
NaNOs 
0 
0 
0 
0 
+ 
+ 
+ 
+ 
0 
0 
orum. Variety 
KNO3 
0 
0 
0 
0 
+ 
+ 
+ 
0 
0 
"Souche Sidit" 
W.G. 
N.G. 
W.G. 
W.G. 
W.G. 
Coccohacillus acridi- 
NaNOs 
0 
0 
0 
0 
+ 
+ 
0 
0 
0 
orum. Variety 
KNO3 
0 
0 
0 
0 
+ 
+ 
+ 
0 
0 
0 
"Souche Cham" 
W.G. 
W.G. 
N.G. 
W.G. 
W.G. 
w!g. 
Bacillus anthracis 
NaNOs 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
KNO3 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
W.G. 
W.G. 
W.G. 
N.G. 
W.G. 
N.G. 
Staphylococcus 
NaNOs 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
pyogenes albus 
KNOs 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
W.G. 
N.G. 
W.G. 
W.G. 
W.G. 
W.G. 
W.G. 
W.G. 
W.G. 
N.G. 
N.G. 
N.G. 
Streptococcus 
NaNOs 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
disparis 
KNOs 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
W.G. 
W.G. 
W.G. 
W.G. 
W.G. 
W.G. 
W.G. 
W.G. 
N.G. 
N.G. 
Checks 
NaNOs 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
(No bacteria) 
KNO3 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
