4 
I 
tf 
SEDGWICK AXD AVINSLOW. 
BACILLUS OF TVrilOII) FKVl l;. 
6]7 
to the 
cold. After twenty-foiir hours of 
\ llllll >]n'0\ of 
quarter 
taken fr 
to half 
om the 
a 
ck was found covering the surfiu'e. ?; 
pper cocks just 
th 
and fi 
mnili's wt'rc H<f 
the lower cocks at tl 
H 
bottom of the barrel, and ^Dortions of the ice were also planted, b 
bottles, after washing with the water produced 
the usual technique. 
Conclusions. 
g 
i \ 
1. These experiments iiiilicate lliat sedimentation does nof i»ro*1 
marked or constant effects on colon and typhoid bacilli in water durin 
period as twenty-four hours. 
1 
g as hi 
Ih . 
horf : 
a 
2. 
the 
hand, the 
exp 
show that ice forincl on llic .'^luT; 
c ( 
.f a 
quiet body of water contains only about ten 
water just below. This difference is probably 
b 
plij'siriil exclusion by 
P 
of 
cry 
and not 
the ice can 
ny 
germicidal 
f 
The 
Illy differ from that of the adj 
y a very sligl 
two d 
fo 
work, 
the low temperaturo, killing out g 
the ice and water nearly equally, and the crystaUizing process extruding gerniR fru 
the ice into the water below. 
* 
i 
DEDUCTION OF BACTERIA BY SEDIMENTATION. 
Top 
Bottom 
Top 
Bottom 
) 
Bottom 
B. CoLi. Series L 
Bacteria per c.c. in samples taken from top and bottom of capk. 
60270 
ri M— A 
ODiO 
11200 
51030 
7070 
51870 
December 29, I SOS. 
51870 
"680 
19320 
4550 
Pocember 3Ct, 1898. 
15G10 
44730 
12390 
13020 
Deceiiiber 31, 1898. 
0800 
8120 
5110 
5Sio 
Kept in room 
1 m)0 
10095 
1 3580 
5495 
40740 
AvrrAfm. 
f.l 32 
2«»i40 
Top 
Bottom 
Top 
Bottom 
1209G0 
114030 
51180 
52920 
Series II. 
January 3, 1899. 
110880 
97050 
114GG0 
103320 
Januar}' 4, 1 *W. 
60910 
60270 
101430 
85050 
,56070 
621 60 
Put outdoors. Temperature -5° to -10 
° C. Surface did not freeze. 
Av« 
1 144.S0 
10»t«U2 
.",1 ft i.^O 
