DISTRIBUTION OF B. COLI COMMUNE 
127 
TABLE IV (a) 
Experiment I 
July 24,1900,1 1 -41; 
a.m., beginning of 
Expt. 
B. coli per grm. 
July 24. 5"4-5 P-m-, 
after 6 hours' ex- 
posure to sun in 
case of 1 and 2. 
B. coli per grm. 
July 25, 6 p.m., 
after 6^2 hours' 
exposure to bright 
sun in case of 1 & 2. 
B. coli per grm. 
July 27, 12 p.m. 
, co 1 per grm. 
Sept. 21, Nos. 5 
and 6 kept in dark 
since July 27. 
B. coli per grm. 
Contents of Petri Dish — 
No. 1 (exposed to sun 
1,2 I 0,000 
Absent in 
Absent in 
and allowed to dry) 
.24 grm. 
.5 grm. 
No. 2 (exposed to sun 
592,400 
Absent in 
t I,I70 
and kept wet) 
.008 grm. 
No. 3 (in shade and 
850,000 
Absent in 
Absent in 
allowed to dry) 
.04 grm. 
.6 grm. 
No. 4 (in shade and 
336,000 
247,000 
3,360,000 
kept wet) 
No. 5 (in dark and al- 
390,000 
1,020,000* 
Absent in 
Absent in 
("Absent in 
lowed to dry) 
.02 grm. 
.5 grm. 
.24 grm. 
No. 6 (in dark and kept 
508,500 
56,800 
1 ,870,000 
1,180,000 
566,000 
wet) 
* Was not then properly dry. J It was impossible to take more for analysis on account of the extraneous organism 
which had found their way in. % There appears to be a discrepancy here, to correct which Experiment II w : as undertaken. 
TABLE IV (b) 
Experiment II 
July 26, 1900, 
10-11; a.m. 
B. coli per grm. 
July 26, S -4S p.m., 
after 7^ hours' sun- 
shine. 
B. coli per grm. 
July 27, 12 noon, after 
5^ hours' sunshine. 
B. coli per grm. 
Sept. 21, in dark since 
July 27. 
B. coli per grm. 
Petri-dish — 
No. 7 (exposed to sun 
and allowed to dry) 
No. 8 (exposed to sun 
and kept wet) 
1,050,000 
1,220,000 
Absent in . 1 3 grm. 
38 1,000 
Absent in .5 grm. 
1,584,000 
tAbsentin.2 8grm. 
47,0:0 
t It was impossible to take more for analysis, owing to the extraneous organisms which had found their way in. 
