Letter, 3 November 1883
Letter, 27 November 1857
Letter, 29 December 1893
The Canadian Record of Science, July 1897
Additional report on erect trees containing animal remains in the coal formation of Nova Scotia
Note on a paper on "Eozoonal structure of the ejected blocks of Monte Somma"
The animal nature of Eozoön
Preliminary note on recent discoveries of Batrachians and other air-breathers in the coal-formation of Nova Scotia
New species of Cretaceous plants from Vancouver Island
The correlation of early Cretaceous floras in Canada and the United States