Here is some news from Ron Zinck, who posts to the NSRoots mailing list quite often -
“I spent part of my Friday the Archives of Ontario working my way through
the collection of Rev. Ewen MacDonald. He worked for decades on Scottish
history and the McDonald family history. I have a number of scans that may
be of interest to researchers and I suspect I will have allot more after
every visit. This batch includes letters and a few charts that discusses
Antigonish, Cape Breton, and different septs in Scotland.
I hope that some of the MacDonald researchers will be able to help decipher, interpret and place these scans in context."
I uploaded them onto Google drive at this link