The patient had had epilepsy, for the cure of which she went to Aix. There she had all sorts of fits and day-somnambulism, during which she waited at table, with her eyes shut, perfectly. She likewise saw alternately with her fingers, the palm of her hand, and her elbow, and would write with precision with her right hand, superintending the process with her left elbow. These details are peculiarly gratifying to myself, for in the little I have seen, I yet have seen a patient walk about with her eyes shut, and well blinded besides, holding the knuckles of one hand before her as a seeing lantern. However, the special interest of this case is, that the patient was differently affected by different kinds of matter; glass appeared to burn her, porcelain was pleasantly warm, earthenware felt cold. What comment can I make on the preceding wondrous details? Those to whom they are new must have time to become familiar with them; in order, reversing the process by which the eye gets to see in the dark, to learn to distinguish objects in this flood of excessive light. Those who are already acquainted with them will, I think, agree with me that the principle which I have assumed—the possibility of an abnormal relation of the mind and body allowing the former, either to shift the place of its manifestations in the nervous system, or partially to energize as free spirit—is the only one which at present offers any solution of the new powers displayed in catalepsy. One regrets that more was not made of the opportunities of observation which Petetin enjoyed. But there are means, which I shall by-and-by have occasion to specify, through which, in the practice of medicine, and in the proper treatment of various disorders, like instances may be artificially multiplied and modified so as to meet the exigencies of inductive science. In the mean time, let me append one or two corollaries to the preceding demonstration. I. It is evident that the performances of catalepsy reduce the oracles of antiquity to natural phenomena. Let us examine the tradition of that of Delphi.