Birth date from “Scotland, Births and Baptisms 1564-1950” on familysearch.org. Last name is spelled with two r’s (Forrest).

There is also an entry in “Ontario deaths, 1869-1937 and overseas deaths, 1939-1947” on familysearch that has John Forest, born in Lanark, Scotland around 1806, dying around June, 1883 in Admaston, Renfrew, Ontario, that may be him.