Thanks for note on Atlantic dust.

Suggested in private to Edward Forbes that bird migration might follow lines of now sunken land.

Has admired WT’s work for years.

Will some day publish on variation.

Encloses diagram illustrating difference between Chthamalus and Balanus. Specimens sent. Finds no Chthamalus in WT’s collection.

Has read with much interest WT’s book [The natural history of Ireland, vol. 1 (1849)].

Recommends E. S. Dixon’s book [Ornamental and domestic poultry; their history and management (1848)].