Discusses the Duke of Argyll’s book [Reign of law (1867)].
Cites his own views on diversity of structure and beauty.
Encloses letter from Wallace. Sexual selection: evidence advanced by Wallace.
Discusses correlation of growth.
Comments on article in the North British Review [by Fleeming Jenkin].
Discusses the evidence from physics on the age of the earth.
[Four pages of the final letter are missing, but the draft is complete.]