subjective source of stimuli; for visual images, as we know, are the principal constituents of our dreams. The share contributed by the other senses, excepting, perhaps, the sense of hearing, is relatively insignificant and inconstant.

3. Internal (organic) physical stimuli

If we are disposed to look for the sources of dreams not outside but inside the organism, we must remember that almost all our internal organs, which in a state of health hardly remind us of their existence, may, in states of excitation- as we call them- or in disease, become a source of the most painful sensations, and must therefore be put on a par with the external excitants of pain and sensation. Strumpell, for example, gives expression to a long-familiar experience when he declares that "during sleep the psyche becomes far more deeply and broadly conscious of its coporality than in the waking state, and it is compelled to receive and to be influenced by certain stimulating impressions originating in parts of the body, and in alterations of the body, of which it is unconscious in the waking state." Even Aristotle declares it to be quite possible that a dream may draw our attention to incipient morbid conditions which we have not noticed in the waking state (owing to the exaggerated intensity of the impressions experienced in the dream; and some medical authors, who certainly did not believe in the prophetic nature of dreams, have admitted the significance of dreams, at least in so far as the predicting of disease is concerned. [Cf. M. Simon, p. 31, and many earlier writers.] *

* In addition to the diagnostic valuation of dreams (e.g., by Hippocrates) mention must also be made of their therapeutic significance in antiquity.

Among the Greeks there were dream oracles, which were vouchsafed to patients in quest of recovery. The patient betook himself to the temple of Apollo or Aesculapius; there he was subjected to various ceremonies, bathed, rubbed and perfumed. A state of exaltation having been thus induced, he was made to lie down in the temple on the skin of a sacrificial ram. He fell asleep and dreamed of remedies, which he saw in their natural form, or in symbolic images which the priests afterwards interpreted.

For further references concerning the remedial dreams of the Greeks, cf. Lehmann, i, 74; Bouche-Leclerq; Hermann, Gottesd. Altert. d. Gr., SS 41; Privataltert. SS 38, 16; Bottinger in Sprengel's Beitr. z. Gesch. d. Med., ii, p. 163, et seq.; W. Lloyd, Magnetism and Mesmerism in Antiquity, London, 1877; Dollinger, Heidentum und Judentum, p. 130.

Even in our days there seems to be no lack of authenticated examples of such diagnostic achievements on the part of dreams. Thus Tissie cites from Artigues (Essai sur la valeur semeiologique des Reves) the history of a woman of forty-three, who, during several years of apparently perfect health, was troubled with anxiety-dreams, and in whom a medical examination subsequently revealed an incipient affection of the heart, to which she presently succumbed.

Serious derangements of the internal organs clearly excite dreams in quite a number of persons. The frequency of anxiety-dreams in diseases of the heart and lungs has been generally realized; indeed, this function of the dream-life is emphasized by so many writers that I shall here content myself with a reference to the literature of the subject (Radestock, Spitta, Maury, M. Simon, Tissie). Tissie even believes that the diseased organs impress upon the dream-content its characteristic features. The dreams of persons suffering from diseases of the heart are generally very brief, and end in a terrified awakening; death under terrible circumstances almost always find a place in their content. Those suffering from diseases of the lungs dream of suffocation, of being crushed, and of flight, and a great many of them are subject to the familiar nightmare- which, by the way, Borner has succeeded in inducing experimentally by lying on the face and covering the mouth and nostrils. In digestive disturbances the dream contains ideas from the sphere of gustatory enjoyment and disgust. Finally, the influence of sexual excitement on the dream-content is obvious enough in everyone's experience, and provides the strongest confirmation of the whole theory of dream-instigation by organic sensation.