La simulación en la lucha por la vida

Animal Life and Intelligence

Animal intelligence: Experimental studies

Ants and Some Other Insects: An Inquiry Into the Psychic Powers of These Animals

Clever Hans (The Horse of Mr. Von Osten) A contribution to experimental animal and human psychology

Intelligence in Plants and Animals Being a New Edition of the Author's Privately Issued "Soul and Immortality."

Mental Evolution in Man: Origin of Human Faculty

Spiritualism and the New Psychology An Explanation of Spiritualist Phenomena and Beliefs in Terms of Modern Knowledge

Straußenpolitik

The Dawn of Reason; or, Mental Traits in the Lower Animals

The Expression of the Emotions in Man and Animals