BOSTON.

SUDBURY RIVER SUPPLY.- Chemical Examination of Water from Reservoir No. 6, Ashland, collected near the Surface.

NOTE to analyses of 1896: Odor, vegetable and occasionally mouldy, becoming somewhat stronger on heating. The iron was determined in eleven samples, the average amount found being .0155 parts per 100,000. The samples were collected from the reservoir, near the dam. For monthly record of height of water in this reservoir, see table at end of Boston analyses.

BOSTON.

SUDBURY RIVER SUPPLY.- Microscopical Examination of Water from Reservoir No. 6, Ashland, collected near the Surface.

Number.

BOSTON.

SUDBURY RIVER SUPPLY.

Chemical Examination of Water from Reservoir

No. 6, Ashland, collected near the Bottom.

2.55

1.08 4.35 2.05 .0024.0234.0222.0012 .32.0050.0000 1.06 0.9
1.00 4.30
0.70 3.65

.0022.0220.0208.0012 .32

.0050.0000 1.09 0.9

1.50 .0020 .0214.0170.0044 .28 .0070 .0001 0.61 0.8 1.55.0024 .0158.0144.0014 .24.0070.0001 0.54 0.7 1.45.0010.0120.0102.0018 .30 .0080.0000 0.56 0.6 1.75.0022 .0154.0126.0028.30 .0070.0001 0.7 1.60.0012 .0110.0100.0010.35 .0050.0002 0.70 0.8 1.60.0008.0202.0180.0022 .34 .0000.0001 0.56 0.8 1.10.0000 .0214.0174.0040 .35.0030.0001 0.50 1.4 1.90.0000.0212.0170.0042.44.0050.0000 0.61 1.1

2.25.0004.0238.0210.0028.56

.0030.0001 0.92 1.7

NOTE to analyses of 1896: Odor, faintly vegetable, becoming stronger on heating. The iron was determined in all the samples, the average amount in parts per 100,000 being .0171. The samples were collected from the reservoir, near the dam. For monthly record of height of water in this reservoir, see table at end of Boston analyses.

BOSTON.

SUDBURY RIVER SUPPLY.- Microscopical Examination of Water from Reservoir No. 6, Ashland, collected near the Bottom.

BOSTON.

SUDBURY RIVER SUPPLY. - Chemical Examination of Water from Cold Spring Brook, at Head of Reservoir No. 4, Ashland.

1896.

15828 Jan. 1 Slight.

Slight. 1.30 4.45 2.35.0004 .0254.0244.0010 .24 .0000.0000 1.56 0.9

Slight.

Slight.
Slight.
V. slight. 0.70 3.00 1.05
Slight. 1.70 4.75 2.55
1.40 4.45
1.30 4.20

1.00 4.20

0.75 3.15

1.90.0008.0186.0164.0022 .24 .0070.0000 0.87 0.8 1.40.0000.0204.0196.0008.10

I .0050.0000 0.66 0.3

.0000 .0160.0138 .0022 .16 .0030.0001, 0.64 0.5 .0016.0342.0304.0038.24.0050.0000 1.22 1.3

2.40

2.35

.0016.0348.0320.0028 .19 .0020.0000

16902 July 1 Slight.
17112 Aug. 3 V.slight. Slight. 0.90 4.40 1.85.0004 .0248.0222 .0026 .28

17336 Sept. 1 V.slight. V. slight. 0.53 4.20

17571 Oct. 1 Slight. 17763 Nov. 2 None.

17976 Dec. 1 V.elight. V. slight. 1.45

Cons. 1.20 6.15
V.slight. 1.80 7.05 4.05
6.90 3.75

NOTE to analyses of 1896: Odor, generally distinctly vegetable and mouldy, becoming stronger on heating. The samples were collected from the brook, at its entrance into Reservoir No. 4.

Microscopical Examination.

The average number of organisms per cubic centimeter found in these samples was 57.