SUDBURY RIVER SUPPLY..

BOSTON.

Microscopical Examination of Water from Reservoir
No. 2, Framingham.

[Number of organisms per cubic centimeter.]

1892.

8425 Jan 16 Jan. 18 Slight.

Cons., 0.90 16.40 6.30 .0490.0392.0300.0092 1.98.7000.0050 4.7 earthy.

8475 Feb. 1 Feb. 2 Distinct. Slight. 8568 Mar. 1 Mar. 2 Distinct. Cons. 8706 Apr. 4 Apr. 5 Distinct Heavy, 0.75 13.70 3.55 .0720.0390.0288.0102 2.00.3000.0066 4.0 earthy.

0.10 15.85 5.05 .0360.0178.0152.0026 2.41.5500.0045 5.1 0.65 16.50 4.15 .0800.0470.0412.0058 3.53.4500.0045 4.9

8841 May 3 May 4 Decided. Cons. 8952 June 1 June 2 Distinct. Cons. 9070 July 5 July 6 Distinct, Slight. clayey.

9191 Aug. 2 Aug. 2 Decided, Slight, milky. fibrous.

0.65 13.45 3.20 .0640.0320.0256.0064 2.01 .2600.0045 5.3 0.30 15.40 3.35 .0090.0236.0154.0082 2.28 .3000.0020 5.0 0.55 17.85 4.20.0110.0272.0240.0032 2.90.2500.0070 6.0

0.35 26.00 8.00.0110.0256.0236.0020 3.64.2000.0200 8.3

9327 Sept. 1 Sept. 1 Slight, Slight. 0.70 19.25 4.20 .0050.0264.0232.0032 2.85.1000.0070 6.9

milky.

9479 Oct. 3 Oct. 4 V. slight. V.slight 0.12 16.85 3.30 .0000.0136.0124.0012 2.82.1600.0005 6.3 9598 Nov. 1 Nov. 1 V.slight. V.slight. 0.08 14.85 2.95 .0000.0122.0086.0036 2.30.1000.0015 5.7 9755 Dec. 5 Dec. 5 Distinct. Slight. 0.70 16.00 3.90 .0316.0250.0224.0026 2.29.2000.0010 6.0

0.49 16.84 4.35 .0307.0274.0225.0048 2.58 .2975.0037 5.7

Av..

Odor of the first six samples, offensive; of the last six, vegetable and occasionally disagreeable, becoming less strong toward the end of the year. The samples were collected from the brook at the first road bridge below Maple Street, about a mile south of the centre of the city of Marlborough.

This brook drains the greater portion of the city of Marlborough, and is a tributary of Stony Brook, one of the tributaries of Sudbury River, above the point where the water supply of the city of Boston is taken. The city of Marlborough constructed a sewerage system in 1891, and the first houses were connected with the sewer in the latter part of that year. Since March, 1892, a large number of connections have been made, and the sewage, which was formerly discharged into vaults and cesspools within the watershed of Walker's Brook, has been carried outside the Sudbury River watershed. At the point where the samples were collected the brook drains an area of 2.05 square miles, or 2.7 per cent. of the drainage area of Sudbury River above the point where its waters are diverted by the city of Boston. This series of analyses is made in order to determine to what extent the pollution of the brook will be diminished by the introduction of the above-mentioned sewerage system.

BOSTON.

SUDBURY RIVER SUPPLY. - Chemical Examination of Water from Stony Brook, at Upper End of Reservoir No. 3, Southborough.

The

Odor, generally distinctly vegetable, frequently mouldy and disagreeable or unpleasant. samples were collected from the brook, about fifty feet below the first road above Reservoir No. 3, at a depth of one foot beneath the surface.

BOSTON.

SUDBURY RIVER SUPPLY. — Microscopical Examination of Water from Stony Brook, at Upper End of Reservoir No. 3, Southborough.

[Number of organisms per cubic centimeter.]

1892.

Jan. Feb. Mar. Apr. May. June. July. Aug. Sept. Oct. Nov. Dec.

Odor, vegetable, frequently mouldy and sometimes unpleasant or disagreeable. The samples were collected from the reservoir near the gate-house, at a depth of eight feet beneath the surface. For monthly record of height of water in this reservoir, see table at end of Boston analyses.