21
SAMPLE V. TOPE WELL.
C o l o n y n u m b e r .
L a c t o r e .
S a c c h a r o s e .
D u l c i t e . A d o n i t e .
I n u l i n .
V o g e s a n d P r o s k .
I n d o l .
M o t i l i t y .
G r o u p .
Name of Bacilli.
Gronp and
Remarks.
Total colonies per cc. on agar at 37º-3,020.
Bile salt lactose, medium.
+ —
1 tube of 20 cc. of water taken .. ..
2 tubes of 10 cc.
" . .
..
1
. . 1 + +
++ + + -+ - – III B. 67
.. .. Group I, nil.
3 " 5 cc.
"
. .
. .
2 . . 2 + + + + +
— + — — III Do.
. .. . ..
„ II, nil.
3 " 1 cc. " .. . . 3 .. 3 + + + +
- + - - III Do.
..
.. " III nil.
3
" -1 cc. "
. .
. . 1 2 4 + + + +
- + - - I I I Do.
.. .. „ IV, nil.
3 "
- 0 1 c c . "
. .
. . 1 2 5 + + + +
- + - -- III Do.
..
. .
"
3 6 + + + + + - + - - III Do.
.. . Class I nil.
7 + + + + + +
-+ - - I I I Do.
.. .. „ 11, 9.
Fœcal bacilli in 5 cc. and upwards.
8 + + + + + -+ - - III Do.
.. .. „
I I I ,
nil.
9 + +
++ + -+ - - III Do.
.. .. Undetermined, 1.
No vibrios in 100 cc.
10 + + + + - + - + - - III B. 76.
S A M P L E V I . — T A N K .
1
+ - -
----
-+ - - I
?.. Group I, 7.
2 + + + + - -- + -- III B. 66
.. .. „ II, Nil.
Total colonies per cc. on agar at 37º—560.
3 + -- - -- - - + -- I B. Vesioulosus .. „ III, 3.
4 + + + + - + + -- III B. 76
.. .. " IV, nil.
+ - 5 + - - - - - + -- I B. Vesiculosus.
Bile salt lactose, medium.
6 + -- - - - - + -- I
Do.
.. Class I, nit.
7 + - -- - - - + -- I
Do.
.. " II,2.
8 + - - - -+ --- I
D o .
. .
III 6
1 tube of 20 cc. of water taken .. .. 1 . . 9 + + + + - + - - I I I B. 67
. .
. . Undetemined, 2.
2 tubes of 10 cc "
..
. .
2
. . 10 + - -- - - - + -- I B. Vesiculosus.
3 " 5 cc
" .. ..
3 . .
3 "
1 cc
"
. .
. . 3 ..
3 „ -1 cc
"
..
. . 3
. .
3 „
- 0 1 c c
" . .
. . 1 2
I
Fœcal bacilli in -1 cc. and upwards.
No vibrios in 100 cc.
REPORT.
In one way or another most of the samples on this occasion show very bad results. The only water
that gives good results is that from the Tope well, which but for a very high total count is satisfactory
enough. This is all the more strange as this water was singled out, at the corresponding period of last
year for special condemnation, and in May 1909 for special purity.
At the other end of the scale and about as bad as it could be is the water of well No. I which at this
season last year was singled out as the best of the lot. Such variations are not a little puzzling, but a well
water having a very high total count, a hundred fœtal germs to the cc. and true Coli Communis in it is
very bad.
The water of well No. II shows evidence of very extensive pollution with excremental matter. There
are one hundred fœcal germs to the cc., that is one in three of the germs present is of excremental
origin. There is also an astonishingly large number of varieties present, in the ten colonies selected for
farther study there were no less than seven species present.
The pollution in the water of well No. III is less in amount but more objectionable in kind than the
last. The presence of B. Schaefferi, belonging to the susceptible Class I, indicates recent and therefore
dangerous pollution.
The waters from well No. IV and from the tank call for no special remark. Compared to the others
they are intermediate in quality, but are not good.
Chemically the waters are fair and soft. The water of the Tope well, in that it contains the least
amounts of total solids, chlorides and nitric nitrogen and is specially soft, is much the best. If this water
could be protected from the contamination which undoubtedly can get access to it at times, it would give a
very desirable supply.