On further examination the face and person stood out more clearly, and the features became more distinct, the longer I looked. Each accidental fold or shadow on the cap was transformed into bright eyes, strongly marked eyebrows, into the nose, mouth, hair, beard, and neck; so that as I went on I had before me a perfectly chiselled face corresponding to the type which had first flashed across my mind as the confused impression of a face conveyed by the cap and mirror. The same process of evolution was pursued with respect to the limbs, the breast, arms, legs, and feet; parts of the body which at first appeared to be vague and indeterminate gradually, and as if by enchantment issued distinctly from every fold of the shirt, from every shadow, angle, and line, so as to compose what Dante would call _una persona certa_. Finally I saw before me a man dressed in white, of an athletic form, sitting in the easy chair and looking fixedly at me: the whole body was in harmony with the head, which had first resulted from the rude resemblance to a human face. The image appeared to me so real and distinct that on rising from the bed and gradually approaching it, its form did not vanish, even when I was near enough to touch the object which produced it. An analysis showed that the features, limbs, and position corresponded in every point with the folds and relative position of the articles of dress which had formed it. A similar process, issuing in such apparitions, is a frequent cause of illusions, which in the case of ingenuous, superstitious, and primitive peoples, may lead to the firm conviction that they have seen an apparition. This has certainly been the case in primitive and even in civilized times, and has given occasion to myths, legends, and the worship of tutelary deities and saints. If we consider the causes of such a phenomenon, and analyze its elements and motives, we shall, I think, discover that it goes far to explain many normal and abnormal hallucinations.