Josiah Wolcott was a New England portrait and landscape painter, active from 1835 to 1857. He exhibited at the Boston Athenaeum in 1837.
In addition to the painting on this site of The Flume, he is known to have painted Mount Kearsarge from Rattlesnake Hill (oil on canvas, 18 x 24 inches, private collection in 1960).
References
New Hampshire Scenery
Osgood, Nancy
Who Was Who in American Art