One aspect of the Clearances that apparently overdone was that emigrants from Scotland were transported to Canada in the most appalling of sailing ships. A couple of historical presenters as the Scottish Studies spring and fall colloquiums made this point - A number of ships made several crossings with emigrants on board and returned with materials from the colony i.e. wood, furs etc. The Irish didn't fare nearly as well with the coffin ships and high death rates and this source was used in the Clearances.

Anyway both my Scottish ( 1831) and Irish ( 1855 ) ancestors made it successfully to south-west Ontario and were primarily done in by cholera.

Interesting books however.