veying in the route.
Samuel Thompson of Woburn made the preliminary survey, and the work was under the charge of Col. Baldwin, whose interest the enterprise only ceased with his life in 1808.
During work in Wilmington, was discovered the tree from which the famous Baldwin apple originated.
Mr. Thompson, who was a soldier of the French War, and whose diary is replete with interest, seems to have labored under a disadvantage, but his work led up to a complete survey by an expert survey, Samuel Weston.
He found that the Merrimack River at Chelmsford was lower than the highest point the canal would traverse, instead of higher, as was at first supposed; so that other water than that of the Merrimack must fill the canal in its course through the Middlesex towns to the Charles, in Charlestown.
Eleven streams of varying size flowed across, and all but one below its course.
The Concord River at North Billerica crossed it at grade and being at its highest level, would supply it in either