I just found a series of books on the history of the Scots in Canada by Lucille Campey. She has one book that gives a general overview, An Unstoppable Force: The Scottish Exodus to Canada, but also has a number of other titles focusing on specific regions -- Upper & Lower Canada, New Brunswick, etc. I've been looking at them on Google Books, and they look quite good.

I also recommend Matthew Shaw's Great Scots! How the Scots Created Canada by Matthew Shaw:

http://www.hrtlandbooks.com/books/greatscots.htm

Regards,

Todd