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Rh delusion; for in general one set of ideas chases another so rapidly, that there is not time for either of them to engross the attention of the intellect; more especially since (as already remarked) there is usually such a degree of self-consciousness preserved throughout, as prevents the individual from entirely yielding himself up to the suggestions of his ideal faculties. M. Moreau mentions, however, that on one occasion, having taken an overdose, and being sensible of unusual effects, he thought himself poisoned by the friend who had administered it, and persisted in this idea in spite of every proof to the contrary—until it gave way to another, namely, that he was dead, and was about to be buried; his self-consciousness, however, being yet so far preserved that he believed his body only to be defunct, his soul having quitted it. But when this is altogether suspended, as it seems to be by a larger dose, the erroneous ideas become transformed into convictions, taking full possession of the mind; although sudden gleams of common-sense burst through the mists of the imagination, and show the illusive nature of the pictures which the "Internal Senses" have impressed on the Sensorium. All this—as every one knows, who has made the phenomena of Insanity his study—has its exact representation in the different stages of Mental Derangement; the illusive ideas and erroneous convictions being in the first instance capable of being dissipated by a strong effort of the Will, gradually exerting a stronger and stronger influence on the general current of Thought, and at last acquiring such complete mastery over it that the Reason cannot be called into effective operation for the correction of the perverted Ideas.

Here, then, we have an extraordinary exaltation of the Automatic action of the Brain, manifesting itself in the rapidity and intensity of the current of Thought; while the controlling power of the Will is not only relatively, but absolutely reduced. And this modification of the normal form of mental activity is clearly referable to the perversion of the normal action of the Blood upon the Brain, which is due to the introduction of a new Physical agent into the former. The production of errors of Perception, arising from the tendency to magnification of the impressions actually made on the senses, is a peculiarly interesting feature of this perversion; which is clearly a mental misinterpretation, not at all corresponding to the mere double vision of the drunken man, which is an error of sense arising from the temporary want of adjustment of the axes of the eyes. And with this magnification there is connected a sentiment of happiness which attends all the operations of the mind.