Kentucky whiskey, from Bourbon county.

1

1857.  When a barrel of Bourbon, or Monongahela, or Double Rectified was accessible, they forgot even in some instances to ask the politics of its possessor.—T. H. Gladstone. ‘Englishman in Kansas,’ p. 40.

2

1859.  The young man John, for instance, asked me to come up and try some “old Burbon,” which he said was A 1.—Holmes, ‘The Professor at the Breakfast-Table,’ chap. vii.

3