Gradation in the eye.
Hooker intends to reply [to W. H. Harvey’s article in Gard. Chron. (1860): 145–6].
Discusses Aspicarpa with respect to correlation.
Comments on monstrous animals.
Discusses objections of Bronn and Asa Gray to natural selection. Cites parallel between natural selection and Newton’s concept of gravitation.
Mentions German experiments on spontaneous generation.