of Edinburgh, Session 1885-86, 
491 
Table I. 
Monthly Analyses of the Water supplied by the Grand Junction 
Water Company, with the Number of Colonies of Micro- 
Organisms per gramme. 
May 
June 
July 
Aug. 
Sept. 
Oct. 
Nov. 
Grains 
Grains 
Grains 
Grains 
Grains 
Grains 
Grains 
Chlorine, 
Nitrogen as ammonia, . 
per gal. 
per gal. 
per gal. 
per gal. 
per gal. 
per gal. 
per gal. 
1-8 
1-15 
1-30 
1-25 
1-20 
1-20 
1-3 
•1398 
•1362 
•1309 
•1453 
•1403 
•1307 
•1601 
Free ammonia, 
•0009 
•0006 
•0006 
•0008 
•0007 
•0010 
•0009 
Albuminoid ammonia, . 
•0039 
•0036 
•0048 
•0063 
•0051 
•0061 
•0039 
Oxygen consumed in 15 
minutes at 100° F., . 
•0714 
•0388 
•0431 
•0592 
•0292 
•0386 
•0047 
Oxygen consumed in 4 
hours at 100° F., . 
•1050 
•0967 
•0754 
•1001 
•0544 
•0648 
•1680 
Hardness before boiling, . 
11-3 
11-79 
12-59 
12-49 
12-00 
14-91 
13-91 
,, after boiling, 
2-9 
2-85 
3-44 
1-76 
2-44 
2-64 
2-23 
Total solid residue, 
17-0 
17-0 
18-0 
17-5 
18-0 
20-5 
20-0 
No. of colonies of micro- 
organisms in 1 gramme 
of the water, 
160 
68 
276 
1000 
96 
173 
54 
Table II. 
Monthly Analyses of the Water supplied by the West Middlesex Water 
Company, with the Number of Colonies of Micro-Organisms per 
gramme. 
April 
May 
June 
July 
Aug. 
Sept. 
Oct. 
Nov. 
Grains 
Grains 
Grains 
Grains 
Grains 
Grains 
Grains 
Grains 
per gal. 
per gal. 
per gal. 
per gal. 
per gal. 
per gal. 
per gal. 
per gal. 
Chlorine, 
1-25 
1-20 
1-20 
1-25 
1-15 
1-20 
1-2 
1-2 
Nitrogen as ammonia, . 
•1438 
•1264 
•1438 
•1273 
•1320 
•1487 
•1260 
•1570 
Free ammonia, 
•0012 
•0014 
•0004 
•0008 
•0006 
•0008 
•0008 
•0007 
Albuminoid ammonia, . 
•0084 
•0045 
•0041 
•0052 
•0051 
•0057 
•0042 
•0039 
Oxygen consumed in 15 
minutes at 100° F., 
•0749 
•0636 
•0466 
•0538 
•0329 
‘0233 
•0518 
•0020 
Oxygen consumed in 4 
hours at 100° F., 
•1631 
•1225 
•1414 
•0861 
•0686 
•0472 
•0777 
•1540 
Hardness before boiling, . 
12-63 
10-8 
12*93 
11-38 
11-84 
12-66 
13-76 
12-78 
„ after boiling, 
2-48 
3T 
2-64 
3-74 
1-91 
2-85 
2-38 
2-05 
Total solid residue, 
17-00 
16-5 
18-0 
17-5 
16-5 
18-5 
19-0 
18-0 
No. of colonies of micro- 
organisms in 1 gramme 
of the water, 
90 
140 
225 
1223 
125 
979 
583 
30 
