I don't have a lot of information on William Buchanan, but I know that he lived in the village of Aline in the parish of Lochs on the Isle of Lewis.
This village was cleared to make way for sheep farming c1827, and I believe that William went to the village of Tong in Lewis for a short time before
emigrating to Canada.
Aline was settled in the mid 1700's to protect the Lewis border from incursions by Harris tenants. The Buchanans (it is believed) came from to Aline from
Kirkibost in Bernera, Isle of Lewis, probably as a result of the Kelp industry.
A letter by the factor in c1824 states
"The most of the Achlinn (Aline) tenants will go to America if removed. They are very decent, obedient tenants and good kelp maufacturers."
I will try to find you more information if you are interested.
I would be very interested in any further information you may have on this family and their decendants