ii
are involved, and. it must also be borne in mind that undetermined species are most
likely to belong to the classes that are prevalent in the particular water. That is to
say that the great majority of undetermined species are likely to belong to the less
objectionable classes, as only a few of the samples examined show the presence of
microbes of the dangerous class I type. There seems also to be a reduced tendency
for undetermined species to occur in the same sample with organisms of class
During the first half of the year organisms belonging to class I were found in thirty
samples but in only six of these, or one-fifth of the number, were species, whose
resisting power had not been determined, also found. As pointed out above the
proportion of all samples showing the presence of germs of this kind is more than a
third.
Altogether 509 complete bacteriological and 365 complete chemical examinations
of water were made in the course of the year. The results of the routine examina-
tions are printed as appendices to this report, those dealing with the jail supplies
forming appendix 1, Parts I and II, and those dealing with town supplies forming
appendix No. 2, Parts I, II, III and IV.
There has been a rise in the number of specimens sent to the Institute for
examination and report. In table No. I these are arranged to show the nature of the
material and the examination required, the result positive or negative, and the total.
TABLE I.
Description of specimens.
Number
of
positive
results.
Number
of
negative
results.
Total.
Remarks.
Plague, human ..
..
..
..
..
..
85
*140
225 * Includes 12 showing putrefac-
tive changes.
Do. animal ..
.. ..
..
..
125 †1,416
1,541 † Includes 73 do.
Blood for Widal test ..
..
..
..
.. ‡510
183
693 ‡ 242 (positive 1 in 96) and 268
(positive 1 in 32).
Gartner's reaction ..
..
..
..
..
Nil.
30
30
Para typhoid—A.
..
..
..
..
.. Nil.
2
2
Do.
B
..
..
..
..
..
8
46
53
Blood for Malta fever
..
..
..
..
5
5
10
Do. for malarial parasites.
..
..
..
29
335
364
Do. for leucocytosis and differential count
..
. .
.
..
217
Do. kala azar..
..
..
..
Sputum for tubercle bacilli ..
..
..
..
8
58
66
Discharges for gonococci ..
. . ..
..
11
1
12
Specimens for lepræ bacilli ..
..
..
..
5
13
18
Do. cholera rWater
. . ..
..
4
Nil.
4
water Stools..
..
..
..
4
10
11
Urine for chemical and microscopical examination
..
..
1 4
Stools for ova and amoeba
..
..
..
. .
.
8
Specimens for Spirochasta pallida ..
. . ..
Nil.
2
2
Growths -Pathological
..
..
.
..
..
..
10
Mosquitoes ..
..
..
..
..
..
. .
..
3
Piroplasmosis ..
..
..
..
..
..
5
29
34
Surra ..
..
..
..
..
..
..
Nil.
1
1
Anthrax ..
..
..
.. ..
..
..
6
4
10
Filaria ..
..
..
..
..
..
.. Nil.
9
9
Diphtheria ..
..
..
..
..
..
1
2
3
Brain fur rabies
..
..
..
..
1
2
3
Disinfectants tested for valu
..
..
..
..
..
6
Hycol, commercial carbolic acid,
soluble phenyls, saponified
oreasol, cyllin and alcoholic
solution of biniodide of mer-
cury.
Water samples for Bacteriological analysis ..
..
..
509
Chemical
do.
..
..
..
365
Miscellaneous ..
..
.. ..
..
..
. .
..
15
Unsuitable ..
..
..
..
..
..
. .
22
Total ..
810
2,329
4,308
There are one or two points that shew considerable divergence from last year's
results.
Plague.—Somewhat fewer specimens were sent for report but the percentage of
positive results was very much higher both with respect to plague in human beings and.
in animals. The percentages of positive results were 37.7 and 8 respectively, as