CD has suggested an explanation of how pike were introduced to a remote lake in Ireland by cormorants [carrying pike spawn on their feet or in their gullets].

Hybrid insects.

Description of the Salvages.

Variability of "transition groups" of insects; relation of variability to ranges of insects. The variability of wings, even within species. Reduction of flying ability on isolated islands.

Forbes’s "Atlantis" theory and insect fauna of the Atlantic islands, considered with regard to insect migrations.

Gives instances of sexual differences in the number of tarsi within species of Coleoptera and also variation in the number of tarsi between related species.

CD’s tabulation of colonists curious but explicable.

Working on Tasmanian flora; contemplating general essay on Australian distribution: Tasmania and Australia same alpine species; Swan River flora very peculiar and quite distinct from New South Wales.

Trying to establish new journal at Linnean.

Comparison of skulls of Ichthyosaurus and Cetacea.

JDH criticises C. J. F. Bunbury’s paper on Madeira [J. Linn. Soc. Lond. (Bot.) 1 (1857): 1–35].

Absence of Ophrys on Madeira suggests to JDH a sequence in creation of groups.

Why are flightless insects common in desert?

Australian endemism.

On the ova of the salmon in relation to the distribution of species.