I, too, have found this a dead end. I recently found entries in "A Dictionary of Scottish Emigrants to Canada before Confederation." p. 111 says David "b. 1815, prob Edinburgh" and Jessie Harvey "b. ca 1817 prob Dumfries." I have checked Scotlandspeople and have found nothing on them. If you are interested in some descendants in the US, I have some on kljordan.org.
Ken Jordan