P.R.M. Malloch

1970 - 1981

Allan M. Old

1960-1969

G.W. H. Louden

1952 - 1959

J.T. O'Hara Thomson

1940 - 1951

Chalmers Grant

1933 - 1939

G.S. Peebles

1918-1933

C.W. G. Taylor

1914-1918

John McIntosh

1874 - 1913