Stone

brick, and cement are used for the encasing masonry. When the conduit reaches the Harlem river, the water is conveyed in iron pipes over a splen: did bridge, 150 feet above the river. An aqueduct for supplying Boston with water was first built in 1846- 1848, and exattly 30 years later a new aqueduct was built from the Sudbury river to Boston, and was carried acro the Charles river and Waban valley by two fine bridges. As the supply of water did not prove_sufficient for the growth of the city, a large reservoir was built, taking a large part of the town of Boylston, Ma ., so that it was supposed the supply of water, when the valley was filled would suffice for many years. E.8&