Burpee was a fervent supporter of many causes, from the need for a national library to the independence of Poland. On the latter he published a 1939 wartime article "Poland’s fight for freedom" in the Canadian Geographical Journal. On his way to Warsaw in 1946, Burpee died at Oxford, England. He is buried there, although he is also memorialized on a stone in Beechwood Cemetery.
^"BURPEE, Lawrence Johnstone". The Canadian Who's Who,1: pp. 31–32. 1910.Note: this Who's Who entry actually has the misspelling JOHNSTON — this and similar sources have created fairly common misspelling of Burpee's middle name.