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 direction with water.
Here, in the seventeenth century, a mill was erected and thither came the colonists with their corn to be ground.
Later woolen mills were established, but the ancient terms of the grant required the maintenance of the grist mill; which requirement the canal company carried out, strengthening and making tighter the dam in 1798, and thirty years later, building the present stone dam. This still holds the flood of water, and supplies power to the great factories of the Talbot and the Faulkner companies.
Over all the other streams the canal had to be carried and due regard paid to their changeful moods.
A brook that in summer is insignificant, in spring may assume threatening proportions, or carry destruction in its track.
Some were but slightly lower; while the Shawsheen was spanned by a wooden aqueduct one hund
ir; it had long, hard seats, and a box stove with a long funnel; and there Miss Swan's youthful children gathered for instruction after church service in the morning.
When all were seated her word of caution for quiet went forth while she made a short prayer, after which instruction was given; then singing and good advice from the superintendent, and the short service was at an end. Major Swan lived at one time in a house just south of the Medford hotel, in 1803 occupied by Major Warner.
In 1798 he moved to the house which is now (remodelled) owned and occupied by Mr. A. D. Puffer. Miss Hannah Swan occupied the place about a year after her mother's death, 1826.
Her father died, 1825.
Mrs. Rowson ever held the pupils entrusted to her care in affectionate remembrance, and continued in correspondence with many of them to the end of her life.
That Miss Swan was a favorite, letters which have been preserved testify.
The following acrostic to her appears in her teacher's biography:—