However, the 16th-century historian John Stow attributes the name to a different watercourse: the "Old Bourne" ("old brook"), a small stream which he believed ran into the Fleet at Holborn Bridge, a structure lost when the river was culverted in 1732. The exact course of the stream is uncertain, but according to Stow it started in one of the many small springs near Holborn Bar, the old City toll gate on the summit of Holborn Hill. Other historians, however, find the theory implausible, in view of the slope of the land.