L to R: 1, 2, 3.

At the observatory?

Yes, at the Montreal Centre Observatory. In front of blackboard, Jim Low; in front of bookcase, Isabel Williamson, far right Charles Good (I was probably the photographer!)
—Geoff Gaherty, August 2012.

Front row: George Wedge, Vern Ramsay, Constantine Papacosmas, Isabel Williamson.

2nd row: Dorothy Yane, Katharine Zorgo, ?, David Zackon.

3rd row: ?, David Sands, David Stills, Geoff Gaherty

4th row: ?

5th row: Jim Low, ?, ?.

L to R: Isabel Williamson, Vern Ramsay, Constantine Papacosmas, Geoff Gaherty, David Stills.

Foreground: E. E. Bridgen, ?
Standing: Miriam Burland?, Ian McLennan, Mario ?, George Wedge, Frank DeKinder, ?, Dorothy Yane, ?, Mme. J. P. Jean?

Standing, l to r: C.S. Beals, F. Troyer?, Charles Good, Helen Hogg, Ruth Northcott, Andrew McKellar, Fleurange Laforest, A. R. McLennan, Dorothy Yane, Frank DeKinder, Katherine Zorgo, ?, A. Vibert Douglas?, Isabel Wiliamson, E. E. Bridgen?.

Seated at far right: Mrs. Good.