... construction of said canal. It was further provided that the proprietors might hold real estate to the value of $30,000 over the value of the canal; also to render Concord River boatable as far as Sudbury Causeway, through Billerica, Carlisle, Bedford, Concord, to Sudbury, a distance of twenty-three miles. This formed a portion of Mr. Sullivan's far-reaching plan for inland waterways, extending well i...