3 Essays: The Anorthosite Rocks of Canada by Frank D. Adams, Geological Survey of Canada ; The Culm Measures of Devonshire. By W.A.E. Ussher, F.G.S. ; On Palaeosaccus Dawsoni, Hinde, A New Genus and Species of Hexactinellid Sponge from the Quebec Group (Ordovician) At Little M
