From the Ontario Archives, a Second Heir and Devisee Commission Case Files Database with a (partial) search result Search Results for "Cameron" below:
#1 Cameron, Alexander, Lancaster Twp.:
An explanation of heirs/devisees (excerpted below).
Once you have identified case files that interest you, you may:
consult the reel or reels of microfilm at the Archives of Ontario in Toronto
borrow the reel or reels of film through your local library using Interlibrary Loan
borrow the reel or reels of film from a Family History Centre of the Church of Jesus Christ Latter Days Saints (note the different microfilm reel number)