Source: Per Facebook post by Allan Miller at the Essex and Kent Scottish Facebook Page.
Find-A-Grave
Family Search: Private Harry Johnstone was born on 10 March 1882, in Lerwick, Shetland, Scotland, United Kingdom. He had at least 1 daughter with Emma. He immigrated to Canada in 1913 and lived in Chatham, Kent, Ontario, Canada in 1916 and Toronto, York, Ontario, Canada in 1922. He registered for military service in 1916. In 1916, at the age of 34, his occupation is listed as bricklayer in Chatham, Kent, Ontario, Canada.
History of the 18th Battalion CEF, "The Fighting Eighteenth" 