The question will naturally arise among the enlightened lovers of truth, why so grand and so _demonstrable_ a science should for forty-five years have made so little progress toward general recognition. It is sufficient to say that new and revolutionary truth is never welcomed, and, if the discoverer is not active as a propagandist it has no diffusion. I did not feel that there was any receptiveness across the ocean for what was resisted here. Nevertheless I did prepare and send to Edinburgh, in 1841, a brief report of my discoveries accompanied by an endorsement or introduction from the venerable Prof. Caldwell, the founder of the successful medical college at Louisville, whose lectures were attended by four hundred pupils. I supposed the gentlemen of the Phrenological Society at Edinburgh the most liberal parties in Great Britain, but they declined publishing my memoir as _too marvellous_, and proposed merely to file it away as a caveat of the discovery. That ended all thoughts of Europe; and, indeed, it seemed to me premature to urge such a discovery and so grand a philosophy upon the world in the present state of its intellectual civilization. I ceased to agitate the subject for many years, and allowed myself to be drawn into the political agitations connected with our civil war, to mitigate some of its social and political evils. Of late, however, an urgent and imperative sense of duty has put my pen in motion as the remnant of my life will be hardly sufficient to record the results of my investigations. In the "New Education" and the "Manual of Psychometry--the dawn of a new civilization"--I have appealed to the public, and three editions of the former with two of the latter show that the public is not indifferent. The recognition of the marvellous claims of Psychometry will prepare the way for the supreme science of Anthropology, to which the coming century will do justice. In justice to the learned Prof. Caldwell and myself, I should not omit to mention that this distinguished, eloquent, and venerable gentleman, who, in his early life, was a cotemporary of the famous Dr. Rush, of Philadelphia, and throughout his life was a champion of the most progressive doctrines in Biology, not only gave his friendly co-operation on the first presentation of my discoveries, but ten years later honored me with a visit at Cincinnati, to become more fully acquainted with them, and subsequently, by appointment of the National Medical Association, prepared a report upon subjects of a kindred nature, in which he incorporated a statement of my discoveries. His subsequent illness and death, in 1854, at an advanced age, prevented the delivery of this memoir.