The Canal Boatman is walking along the banks of the canal, his horse pulling a barge, whip in hand. There is a delightful patch sewn onto his knee. Glengarry bonnets were obviously popular with working men in Adam’s time; the series of glass shows three. 
The boatman is on the aqueduct to the north of the Burgh Halls over Maryhill Road. 
The spire is that of Maryhill High Free Kirk (now converted to housing). By the 1870s many of the barges were steam powered. The barges carried bulk goods such as grain, coal and fertiliser.