I think you will find Donald Stewart buried at South Lochalsh cemetery in Ashfield Township, Huron County (the other side of the road is Huron Township, Bruce County). My Stewart family also was in Lochalsh between 1851 and the 1880's weh they re-emigrated to Duluth, Minnesota. My gggrandfather was Alexander stewart (b. 1829 in Lochalsh, Scotland d. 1907 Lochalsh, Ontario) who married Christine McKenzie. Their son., my ggrandfather, was named Donald Stewart. He emigrated to Minnesota. I would guess that there is a relationship between teh families.