It is not denied, even by those who oppose modern theories respecting the genesis of organisms, that there are, excluding some psychical elements, many and important points of resemblance between man and animals in the exercise of their consciousness, intelligence, and emotions, if indeed they are not identically the same. The comparative psychology of man and animals plainly shows that the perceptions, both in their respective organs and in their mode of action, act in the same way, especially in the higher animals; and the origin, movements, and associations of the imagination and the emotions are likewise identical. Nor will it be disputed that we find in animals implicit memory, judgment, and reasoning, the inductions and deductions from one special fact to another, the passions, the physiological language of gestures, expressive of internal emotions, and even, in the case of gregarious animals, the combined action to effect certain purposes; so that, as far as their higher orders are concerned, animals may be regarded as a simple and undeveloped form of man, while man, by his later psychical and organic evolution, has become a developed and complex animal.[4] In my book on the fundamental law of intelligence in the animal kingdom, I attempted to show this great truth, and to formulate a principle common to all animals in the exercise of their psychical emotions, by setting forth the essential elements as they are generally displayed. I think I was not far from the truth in establishing a law which seems indubitable; although, while some men whose opinion is worthy of esteem have accepted it, other very competent judges have objected to some parts of my theory, but without convincing me of error. I repeat my conclusions here, since they are necessary to the theory of the genesis of myth, which I propose to explain in this work. I hold the complete identity between man and animals to be established by the adequate consideration of the faculties, the psychical elements of consciousness and intelligence, and the mode of their spontaneous exercise; and I believe the superiority of man to consist not so much in new faculties as in the reflex effect upon themselves of those he possesses in common with the animals. The old adage confirms this theory: _Homo duplex_.