Boston, ward 4, precincts 7 and 10, ward 5, precincts 2, 9 and 10, ward 21, precincts 1 to 3, inclusive, and 5, and 8 to 16, inclusive, ward 22, precincts 3 and 4, and 6 to 13, inclusive, in the county of Suffolk; Cambridge, ward 9, precincts 2 and 3, ward 10, precincts 1 and 3, and ward 11, and Belmont and Watertown, in the county of Middlesex.