Summary

Comments on a discussion of humming-birds by the Duke of Argyll [in The reign of law (1867)].

Encloses article by Henry Parker on the Duke’s book [Saturday Rev. 23 (1867): 82–4].

Summary

Discusses hybridisation in cowslip and primrose.

Mentions proposed visit.

Summary

CD probably advised omitting mention of experiments suggesting that oxlips, cowslips, and primroses could be produced from the seed of a single plant

Summary

Curious to read what CD will say on man and his races.

Has CD seen Ludwig Rütimeyer’s Ueber die Herkunft unserer Thierwelt (Rütimeyer 1867c)?

Discusses J. F. W. Herschel’s theory of active volcanoes existing at the junction of continents and the sea.

Summary

Chapter 12 [of Variation] finished;

too late to include information on six-fingered men. Plans for book on man [Descent].

Mentions coral reefs of Tahiti.

Discusses volcanic islands; volcanoes of the Cordillera.

Summary

Comments on proof-sheets of Variation.

His revisions of Principles of geology, 10th ed.

Summary

Thanks CL for comments [on Variation].

Thinks Pangenesis would be important step in biology if admitted as probable.

Introduction to French edition [of Origin] has injured the book.

Summary

Replies to CL’s further comments [on Variation].

Discusses direct action of the environment as a cause of variation.

Summary

Describes seeds transported in locust dung. Discusses other cases of transport and migration.

Summary

Discusses transport of frog spawn and young molluscs by birds.