Lola; Or, The Thought and Speech of Animals

On the Nature of Thought Or, The act of thinking and its connexion with a perspicuous sentence

Man or Matter Introduction to a Spiritual Understanding of Nature on the Basis of Goethe's Method of Training Observation and Thought

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