John Buchanan of Whitby is descended from Buchanan of Milton, and some detail of the family is set out in the information dealing with Buchanan of Milton on page 24. Whitby is in Yorkshire.
The arms are the first granted to John Buchanan of Whitby, in 1840, and are superseded by the later grant of 1872 when his descent from Buchanan of Milton was proven.

The arms are recorded in Lyon Register Volume 4, Page 44, 12 March 1840.

THE ARMS: Or, a lion rampant Sable, armed and langued Gules between two quatrefoils in chief of the Third and a thistle in base Proper, all within a bordure Ermine.

THE CREST: A dexter hand Proper holding a ducal cap Purpure turned up Ermine tufted on top with a rose Gules, all within a laurel branch disposed orleways.

THE MOTTO: 'Audaces Juvo' ( I assist the bold )