Note 32 — Chapter IV
Reading edition
From the observations of Sir Roderick Murchison, M. Middendorf, M. de Verneuil, and Count Keyserling, it appears also that the low land of Siberia has been extended since the existing species of shell-fish inhabited the northern seas; a circumstance that must have rendered the Siberian climate still more severe, and materially affected that of the northern parts of Europe and Asia.