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HOLDEN SUPPLY. — Microscopical Examination of Water from

Storage Reservoir.

WORCESTER,
Tatnuck Brook

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WORCESTER.
Record of Heights of Water in Holden and Leicester Storage Reservoirs at Times

when Samples of Water were collected for Analysis. NOTE. – Holden Reservoir, height of rollway, 20.10 feet; Leicester Reservoir, height of rollway, 37.40 feet.

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June 8,

Dec. 14,

18.80

36.16

9.08

25.20

EXAMINATIONS OF WATER SUPPLIES

AND RIVERS.

RIVERS.

[253]

EXAMINATION OF RIVERS.

The regular monthly examination of the waters of three rivers has been continued during the past year. The Blackstone has been examined at four points, the Merrimack at two and the Taunton at one.

Advantage was taken of a drier season than any other since the Board began its regular examinations of water supplies and rivers in 1887, to make special examinations of five rivers, viz., the Blackstone, Quaboag (a branch of the Chicopee), Merrimack, Nashua and Neponset.

Occasional examinations have been made of water from some of the other rivers of the State, and the results are printed in connection with the water supplies of the towns where the samples were collected, and can be found on previous pages of this volume as follows:

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Nearly all of the examinations show an increasing pollution of the streams as compared with previous years. This is caused not only by the fact that the summer and autumn of 1891 were drier than for several years before, but also by an unusually rapid increase in population and manufactures during these years, little being done by the towns and manufacturers to keep the larger streams from becoming polluted.

BLACKSTONE RIVER. A detailed description of the Blackstone River and of the various ways in which it is polluted was given in the special report of the Board on the Examination of Water Supplies, 1890, page 383. As there stated, the Blackstone is the most polluted river in Massachusetts, due for the most part to the sewage and manufacturing refuse

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