On the Genesis of Species

The Mystery of Space A Study of the Hyperspace Movement in the Light of the Evolution of New Psychic Faculties and an Inquiry into the Genesis and Essential Nature of Space

On the Variation of Species, with Especial Reference to the Insecta Followed by an Inquiry into the Nature of Genera

The North American Slime-Moulds A Descriptive List of All Species of Myxomycetes Hitherto Reported from the Continent of North America, with Notes on Some Extra-Limital Species

A Critical Examination of the Position of Mr. Darwin's Work, "On the Origin of Species," in Relation to the Complete Theory of the Causes of the Phenomena of Organic Nature Lecture VI. (of VI.), "Lectures to Working Men", at the Museum of Practical Geolo

The Present Condition of Organic Nature Lecture I. (of VI.), "Lectures to Working Men", at the Museum of Practical Geology, 1863, on Darwin's Work_ "Origin of Species"