builder. Their mother was Mary Crichton, sister to Richard Crichton (1771-1817), an Edinburgh architect, and they appear to have trained under him, taking over his office upon his death.

Their offices were at 9 Blenheim Place near the top of Leith Walk a handsome and unusual building forming part of a terrace designed by Playfair and built by their own father in 1824. It is possible that the unit