d all loose dirt washed out, and on the following day to the pumping station.
Two years and a half had elapsed since the engineers began work.
The entire system, of which this was but an essential part, was also complete and ready for service.
At one time three hundred and fifty men were employed, making a scene of busy activity along its course through Medford.
The completed works supplied not only Charlestown, but Somerville, East Boston, Chelsea and Everett, and were taken over by Boston on the annexation of Charlestown, and later by the Metropolitan Commission.
Because of the pollution of the water by the leather factories of Woburn and Winchester this Mystic supply was abandoned in 1898, and since that time this brick conduit has been the disused subway of which we spoke in beginning.
That it will ever be used again now appears unlikely, unless, indeed-and who knows?-some new and now unthought—of industry, public or otherwise, should arise, to which this great work of a