for then, every nerve having several disposi tions, when the motion of any other nerve i propagated into it, there will be no ground of cause present, why exactly the oscillation m should arise, rather than any other to which it was equally pre-disposed. But if we take the former, and let every idea have a nerve of its own, then every nerve must be capable of propagating its motion into many other nerves; and again, there is no reason assignable, why the vibration m should arise, rather than any other ad libitum. . It is fashionable to smile at Hartley's vibrations and vibratiuncles; and his work has been re-edited by Priestley, with the omission of the material hypothesis. But Hartley was too great a man, too coherent a thinker, for this to have been done, either consistently or to any wise purpose. For all other parts of his system, as far as they are peculiar to that system, once removed from their mechanical basis, not only lose their main support, but the very motive which led to their adoption. Thus the principle of contemporaneity, which Aristotle had made the common condition of all the laws of association, Hartley was constrained to represent as being itself the sole law. For to what law can the action of material atoms be subject, but that of proximity in place? And to what law can their motions be subjected, but that of time? Again, from this results inevitably, that the will, the reason, the judgment, and the understanding, instead of being the determining causes of association, must needs be represented as its creatures, and among its me chanical effects. Conceive, for instance, a broad stream, winding through a mountainous country with an indefinite number of currents, varying and running into each other according as the gusts chance to blow from the opening of the mountains. The temporary union of several currents in one, so as to form the main current of the moment, would present an accurate image of Hartley's theory of the will. Had this been really the case, the consequence would have been, that our whole life would be divided between the despotism of outward impressions, and that of senseless and passive memory. Take his law in its highest abstraction and most philosophical form, viz. that every partial representation recalls the total representation of which it was a part; and the law becomes nugatory, were it only from its universality. In practice it would indeed be mere lawlessness. Consider, how immense must be the sphere of a total impression from the top of St. Paul's church; and how rapid and continuous the series of such total impressions. If therefore we suppose the absence of all interference of the will, reason, and judgement, one or other of two consequences must result. Either the ideas (or relicts of such impression) will exactly imitate the order of the impression itself, which would be absolute delirium: or any one part of that impression might recal any other part, and (as from the law of continuity, there must exist in every total impression some one or more parts, which are components of some other following total impression, and so on ad infinitum) any part of any impression might recal any part of any other, without a cause present to determine what it should be. For to bring in the will, or reason, as causes of their own cause, that is, as at once causes and effects, can satisfy those only who in their pretended evidences of a God having first demanded organization, as the sole cause and ground of intellect, will then coolly demand the pre-existence of intellect, as the cause and ground-work of organization. There is in truth but one state to which this theory applies at all, namely, that of complete light-headedness; and even to this it applies but partially, because the will, and reason are perhaps never wholly suspended. A case of this kind occurred in a Catholic town in Germany a year or two before my arrival at Göttingen, and had not then ceased to be a frequent subject of conversation. A young woman of four or five and twenty, who could neither read, nor write, was seized with a nervous fever; during which, according to the asseverations of all the priests and monks of the neighbourhood, she became possessed, and, as it appeared, by a very learned devil. She continued incessantly talking Latin, Greek, and Hebrew, in very pompous tones and with most distinct enunciation. This possession was rendered more probable by the known fact, that she was or had been an heretic. Voltaire humourously advises the devil to decline all acquaintance with medical men; and it would have been more to his reputation, if he had taken this advice in the present instance. The case had attracted the particular attention of a young physician, and by his statement many eminent physiologists and psychologists visited the town, and cross-examined the case on the spot. Sheets full of her ravings were taken down from her own mouth, and were found to consist of sentences, coherent and intelligible each for itself, but with little or no connection with each other. Of the Hebrew, a small portion only could be traced to the Bible; the remainder seemed to be in the rabinical dialect. All trick or conspiracy was out of the question. Not only had the young woman ever been an harmless, simple creature; but she was evidently labouring under a nervous fever. In the town, in which she had been resident for many years as a servant in different families, no solution presented itself. The young physician, however, determined to trace her past life step by step; for the patient herself was incapable of returning a rational answer. He at length succeeded in discovering the place, where her parents had lived: travelled thither, found them dead, but an uncle surviving; and from him learnt, that the patient had been charitably taken by an old protestant pastor at nine years old, and had remained with him some years, even till the old man's death. Of this pastor the uncle knew nothing, but that he was a very good man. With great difficulty, and after much search, our young medical philosopher discovered a niece of the pastor's, who had lived with him as his house-keeper, and had inherited his effects. She remembered the girl; related, that her venerable uncle had been too indulgent, and could not bear to hear the girl scolded; that she was willing to have kept her, but that after her patron's death, the girl herself refused to stay. Anxious enquiries were then, of course, made concerning the pastor's habits; and the solution of the phenomenon was soon obtained. For it appeared, that it had been the old man's custom, for years, to walk up and down a passage of his house into which the kitchen door opened, and to read to himself with a loud voice, out of his favorite |