Here’s an ad from the November 30 1927 edition of the Toronto Globe for a medical practice:
The Canadian Health Service Institute did not last long into the Great Depression – a listing for it appeared in the 1930 Toronto city directory but not in the 1931 directory.
Searches for James W. Barton in the city directories revealed that the Canadian Health Service Institute was in existence in 1925; before that, Dr. Barton was just listed as a physician. But I also discovered that Dr. Barton was the president of the Matheson Mining Syndicate; apparently, he ran a mining operation when not tending to his medical practice or providing twice-yearly medical examinations at the Canadian Health Service Institute.
I expected the Matheson Mining Syndicate to also have been a casualty of the Depression. But it actually remained in existence for a while, as I found an entry for it in the 1938 city directory. The mining syndicate didn’t survive the outbreak of war, though – the 1940 city directory just lists Dr. Barton as a physician. He continued his medical practice at least until 1951; the 1956 directory lists him, but with no occupation, so presumably he had retired by then.
Just for the heck of it, I also traced Dr. Barton in earlier city directories. I discovered that he had started his professional life as a physician and the physical director for the University of Toronto. He was listed as such in the 1908 and 1910 directories; by 1915, he had moved on to private practice.