Discusses wear and tear due to glaciation and significance of this evidence for dating the glacial period. Mentions views of James Croll and Archibald Geikie on the issue.

Explains how he, as "an orthodox clergyman" reading CD’s works, was totally convinced by his arguments. Expresses pleasure "that Science might make gigantic strides without offering such collateral opinions as, if true, would certainly dispense with clergymen altogether".