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covered by small house; surface water excluded. Said to be never dry. Ground water flows west. Several houses and a few gardens on the long hill above the spring, within a few hundred feet. The houses just across Fremont Street are connected with an iron sewer in that street. The city low-service distributing reservoir is about five hundred feet above the spring. This is the old Lowell Water-cure Spring. Water sold in Lowell.

Brockton, Union Spring. - About five hundred feet south-east from Howard Street and a few feet north-east from Montello Street. Reservoir with planked sides, five by six feet and four feet deep. Water, two feet deep, rises nearly to level of the ground; said to overflow all the year round. Covered by a small house; surface water not completely excluded; a little road wash might enter. Gravelly soil. Well is near the north-east base of a low hill, grass-covered. Nearest source of contamination a cesspool, three hundred and ten feet south-west from spring, on the hillside directly above it. Several more sources of contamination on drainage area within a few hundred feet more. Water sold in Brockton and Campello.

Brockton, Crystal Spring. - Four hundred feet south-west from house of Martin Packard, Pleasant Street, near corner of Pearl Street, Brockton Heights. Stoned and cemented reservoir five by. seven feet and four feet deep. Depth of water three feet; said to overflow all the year round. Covered by plank staging; surface water excluded. Water rises in bottom of well through underlying rock. Ground water flows from north-east and east. Drainage area is covered by wild shrubs and trees for two hundred and fifty feet about the spring. Nearest source of contamination is a manure heap, three hundred and seventy-five feet east. Two houses with privy vaults and barns five hundred to eight hundred feet distant from spring. Water sold in Brockton.

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Everett, Partridge Spring. — A few hundred feet north-west of the corner of Chelsea and Ferry streets, about one hundred and thirty feet above Chelsea Street. Well is seventeen feet deep in grassed orchard, in a small wooden building. Drainage is south, toward low meadows. Cemented wooden privy vault thirty-six feet west; sink cesspool, ten feet deep, sixty feet south-east; covered manure heap seventyfive feet north-west; water-closet cesspool at next house, about one hundred and fifty feet south-west; several others west to north-east, within six hundred feet.

Everett, Everett Crystal Spring. At north-west corner of Chelsea and Ferry streets, close to Chelsea Street side-walk. Well twelve feet in diameter and twenty feet deep, in frame house. Overflow into low meadows south of Chelsea Street. Drainage is south towards these meadows. Several wells north on Cottage Street were lowered when this well was dug, eight or ten years ago. The well at one house on Cottage Street, about thirty feet deep and two hundred and eighty-five feet north of the spring, was changed into a cesspool several years ago. Grassed field between the spring and nearest water-closet cesspool. The latter is two hundred and fifty feet north of the spring well, and is not cemented. Several others on Cottage Street near by.

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Swampscott, Swampscott Mineral Spring. One hundred and fifty feet from Essex Street, and about one thousand feet east from corner of Essex Street and Beach Avenue; about six hundred feet north from Moose Hill Spring. The water comes from a driven well sixty feet deep, and runs continually from this through several feet of iron pipe into the spring house south-west. There it runs into a reservoir about five by nine feet, with two and one-half feet depth of water. This reservoir has plank sides and cement bottom; surface water excluded. Considerable dirt and a little green growth on the bottom of the reservoir. Water rises in the well to nearly the level of the surrounding ground, and overflows all the year round. The lower end of the well pipe is in clay. The ground water comes chiefly from the north or north-east. There is a low hill west, separated from the well by a small meadow and a ditch. The well is in a grassed field. The nearest source of contamination is a stable with a manure heap, fifty feet north-east. There is another about the same distance north-west. There are many houses on the drainage area within a few hundred feet. Water sold only in Lynn.

Everett, Belmont Hill Spring. - About one hundred and twenty feet north-west of Bradford Street, Everett, and about six hundred feet west of corner of Hancock. The water rises nearly to the level of the surrounding land in two wells, eight feet in diameter and four feet deep; gravel bottom and stone sides; surface water excluded. The spring is in cultivated land. The nearest cesspool is about one hundred and fifty feet up the hill, i. e., towards Hancock Street; there are several more within a few hundred feet. Several

exposed manure heaps west of the spring, but no opportunity for their surface drainage to enter.

Everett, Glendale Spring. — On Spring Street, about five hundred feet from Ferry Street. Spring rises to level of ground, in cemented enclosure five feet square and three feet deep, and is covered. Overflows several thousand gallons a day. The spring is in Mills' meadows, part pasture and part cultivated. Nearest cesspool is about four hundred feet away, and above, i. e., nearer Ferry Street. This cesspool is cemented all around, and overflows through a pipe into a ditch two hundred and twenty-five feet from the spring at nearest point. Several other cesspools within a thousand feet run into this ditch, which is not higher than the spring. A few houses on the other side of Ferry Street have cesspools which overflow on the ground. Large manure heap two hundred and thirty feet from spring, toward Ferry Street.

Swampscott, Moose Hill Spring. - About one hundred and fifty feet north from corner of Columbia Avenue and Beach Avenue. Bricked and cemented well in large bottling house. The water flows through a crevice in ledge, and rises nearly to the level of the ground in an oblong stone basin, about five feet long, two feet wide and three feet deep; surface water excluded; spring said to overflow the year round. The soil in the neighborhood is chiefly gravel with boulders, with underlying ledge. The drainage is from the southwest and west. The spring house is in a grassed lot. There is a cesspool ninety feet south-west on the hillside, and more cesspools and privies on the hill within three hundred feet. There is a stable fifty feet north-west of the spring. Water sold chiefly in Lynn and Swampscott.

ON THE

AMOUNT OF DISSOLVED OXYGEN

CONTAINED IN

WATERS OF PONDS AND RESERVOIRS

AT

DIFFERENT DEPTHS.

BY THOMAS M. DROWN, M.D., CHEMIST OF THE Board.

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