BOOKS BY DARWIN, WITH THE ABBREVIATIONS USED IN REFERRING TO THEM IN THE NOTES
The American revised edition is referred to, unless otherwise specified
| A Monograph on the sub-class Cirripedia.—The Balanidæ—The Verrucidæ. | Cirripedia. |
| The Descent of Man and Selection in Relation to Sex. | Descent. |
| The Different Forms of Flowers on Plants of the Same Species. | Different Forms of Flowers. |
| The Effects of Cross and Self Fertilization in the Vegetable Kingdom. | Cross and Self Fertilization. |
| Krause, Ernst, Erasmus Darwin (translated from the German by W. S. Dallas, with a preliminary notice by Charles Darwin). | Krause. |
| The Expression of the Emotions in Man and Animals. | Expression. |
| The Formation of Vegetable Mould through the Action of Worms. | Worms. |
| Geological Observations. | Geological Observations. |
| Insectivorous Plants. | Insectivorous Plants. |
| Journal of Researches into the Natural History and Geology of the Countries Visited during the Voyage of H.M.S. Beagle Round the World. | Beagle Journal. |
| More Letters of Charles Darwin, two volumes. | More Letters. |
| The Movements and Habits of Climbing Plants. | Climbing Plants. |
| The Origin of Species. | Origin. |
| The Power of Movement in Plants. | Movement in Plants. |
| The Variation of Animals and Plants under Domestication, two volumes. | Animals and Plants. |
| The Various Contrivances by which Orchids are Fertilized by Insects. | Orchids. |