Mentions his Plutonic view of earth history.

Cites Lyell’s opinions on loess.

CD doubts contemporaneousness of extinct great animals with ice period.

Cites applicability of Forbes’s theory of glacier structure to structure of volcanic obsidian.

CD is falling astern in the geological race for knowledge.

Informing him of the death of Thomas Henderson at Edinburgh. Robert Main is anxious to obtain the post. Outlines facts concerning Main and the great benefit it would be if he were appointed.

Would like his opinion on which paper on electricity relating to the growth of vegetables, he is to give the £30 reward, as it has to be decided by 3 Dec.