[ 9 ] 
Table I. 
>■ 
June 9. 
Date. 
October 29. 
January 15. 
)epth of water on sand 
'.eservoir Level ... ... , 
ilter Head 
1 
4-7 
3-50 
2.8 
•3 
•55 
iate of Filtration ... 
2.03 
2.71 
2.71 
. 
tain in previous 24 hours ... 
3-76 
Nil. 
remarks ... 
i 
Run 116 days. 
Run 1 month 
Run 47 days. 
i - 
p 5 
? 3 
• a 
£ q 
▼ 
• 
C/1 
5 ~ 
c/5 
* 
c/5 
£ 
• ^ r3 
VI 
SjC 
0 
c 
6 
ndol formatioi 
w ” 
2 u 
= <£ 
^ C/1 
^ X 
O tSf 
cP 
0. of organism 
0 
S-. 
0 
O 
Conkey’s ined 
and gas form; 
7, 
ZL 
0 
C 4 — 
0 
6 
Indol formatio 
2D p 
2 5 
tr. 
- in 
Jr* ea 
2 ar 
0 p 
U « 
z 
O rrl 
Z 
O 
z 
S3 
aJ .22 
intake 
750 
4- 
+ 
73° 
+ 
1 
1.265 
4- 
4- -4CC 
Reservoir ... 
266 
4- 
+ 
3oOO 
+ 
+ 
325 
4- 
4- 
’Inlet to Filter Bed ... 
i 
... 
... 
... 
245 
... 
Filter Well... 
209 
+ 
— - 5 cc. 
716 
_ 
... 
- 5cc. 
413 
4- ..sec. 
f 4-.2CC. 
1 
1 
1 .40c. 
'v 
The other examinations were made mainly in conjunction with 
l 'Dr. Finlayson, and details of the conditions which may have affected the 
working of these filter beds are given separately. 
The results of filtration are shown in the subjoined table. I he number 
of organisms in the intake is not for this purpose of much importance as 
only one or two of the intakes were examined on each occasion. 
The water in Reservoir was taken at the same place on each occasion 
and as a check on this and also as giving a better test ot the water actually 
filtered samples were taken from the water at its entrance to the filter bed. 
Usually this water gave slightly better results than that taken from the 
impounding reservoir itself. 
