Some years ago (November 15th, 1869) Dr. Henry Landor, Superintendent of the London Asylum, Ontario, communicated to the Entomological Society of Canada some observations on the action of Ground-ice, which seem to be of sufficient importance to be reproduced in the pages of this Magazine. The Entomological Society does not appear to publish its transactions, otherwise a simple reference might have sufficed. The account of Dr. Landor's observations here given is extracted from the local Free Press, of London, Ont.