1911 Encyclopædia Britannica, Volume 4… (1911)
“ Commonwealth Avenue, one of the Back Bay streets running from the foot of the Public Garden, is one of the finest residence streets of the country. It is 240 ft. wide, with four rows of trees shading the parking of its central mall, and is a link through the Back Bay Fens with the beautiful outer park system. The park system consists of two concentric rings, the inner being the city system proper, the outer the metropolitan system undertaken by the commonwealth in co-operation with the city. The former has been laid out since 1875, and includes upwards of 2300 acres, with more than 100 m. ”
