McArthur, born just outside Moorefield, Ontario in the township of
Maryborough, Wellington County, Ontario. He was a surgeon and
from the University of Toronto in 1896 as President of his class;
Medical Sciences (8th graduating class). He then went to College of
Surgery in Edinburgh, Scotland and then onto California. His two
brothers; Peter Robb McArthur (b.1868) & Duncan Donald McArthur
(b.1870) followed him and also became doctors.