Bogany, a headland in Rothesay parish, Isle of Bute, flanking the SE side of Rothesay Bay, and terminating about 1¼ mile NE of Rothesay town. A medicinal spring is at its base close to the shore; was discovered in 1831; is much visited by invalids, as a remedy for cutaneous, glandular, and rheumatic affections; and, according to an analysis by Professor Thomson of Glasgow, contains, in every imperial gallon of its water, 1860 -73 grains of muriate of soda, 12.25 grains of sulphate of lime, 129.77 grains of sulphate of soda, 32.8 grains of chloride of magnesium, 14.39 grains of silica, and 17.4 cubic inches of sulphuretted hydrogen.

(F.H. Groome, Ordnance Gazetteer of Scotland (1882-4); © 2004 Gazetteer for Scotland)