Responds to MS of Earthworms. An objective but arbitrary test of intelligence in animals is the ability to learn from experience. Earthworms fall on the border of intelligence. They could justly be called intelligent if they could learn by experience to manipulate some unknown, exotic leaf. CD should make clear that intelligence does not imply self-consciousness.

Accepts GJR’s offer to prepare sugar-cane paper for publication [Villa Franca and Glass, "New varieties of sugar-cane", Proc. Linn. Soc. Lond. (1880–2): 30–1]. Suggests introduction and outline.

Agrees with GJR on microscope for Grant Allen.