• A Monograph on the Sub-class Cirripedia (Volume 1 of 2): The Lepadidae; Or, Pedunculated Cirripedes
• A Monograph on the Sub-class Cirripedia (Volume 2 of 2): The Balanidæ, (or Sessile Cirripedes); the Verrucidæ, etc., etc.
• Charles Darwin: His Life Told in an Autobiographical Chapter, and in a Selected Series of His Published Letters
• Coral Reefs
• Coral Reefs; Volcanic Islands; South American Geology — Complete
• Darwinism stated by Darwin himself: Characteristic passages from the writings of Charles Darwin
• Geological Observations on South America
• Insectivorous Plants
• Journal of Researches into the Natural History and Geology of the Countries Visited During the Voyage Round the World of H.M.S. Beagle Under the Command of Captain Fitz Roy, R.N.
• Life and Letters of Charles Darwin — Volume 1
• Life and Letters of Charles Darwin — Volume 2
• On the Origin of Species By Means of Natural Selection: Or, the Preservation of Favoured Races in the Struggle for Life
• On the Origin of Species by Means of Natural Selection: or the Preservation of Favoured Races in the Struggle for Life. (2nd edition)
• The Autobiography of Charles Darwin
• The Descent of Man, and Selection in Relation to Sex
• The Descent of Man and Selection in Relation to Sex, Vol. I
• The Different Forms of Flowers on Plants of the Same Species
• The Effects of Cross & Self-Fertilisation in the Vegetable Kingdom
• The Expression of the Emotions in Man and Animals
• The Formation of Vegetable Mould Through the Action of Worms: With Observations on Their Habits
• The Foundations of the Origin of Species: Two Essays written in 1842 and 1844
• The Movements and Habits of Climbing Plants
• The Origin of Species by Means of Natural Selection: Or, the Preservation of Favoured Races in the Struggle for Life, 6th Edition
• The Power of Movement in Plants
• The Variation of Animals and Plants under Domestication
• The Variation of Animals and Plants Under Domestication, Vol. I.
• The Variation of Animals and Plants Under Domestication, Volume II (of 2)
• The Voyage of the Beagle
• Volcanic Islands