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[ How powerfully intense joy excites the brain, and how the brain reacts on the body, is well shown in the rare cases of Psychical Intoxication. Dr. J. Crichton Browne (‘Medical Mirror,’ 1865) records the case of a young man of strongly nervous temperament, who, on hearing by a telegram that a fortune had been bequeathed him, first became pale, then exhilarated, and soon in the highest spirits, but flushed and very restless. He then took a walk with a friend for the sake of tranquillising himself, but returned staggering in his gait, uproariously laughing, yet irritable in temper, incessantly talking, and singing loudly in the public streets. It was positively ascertained that he had not touched any spirituous liquor, though every one thought that he was intoxicated. Vomiting after a time came on, and the half-digested contents of his stomach were examined, but no odour of alcohol could be detected. He then slept heavily, and on awaking was well, except that he suffered from headache, nausea, and prostration of strength.]
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[ Dr. Darwin, ‘Zoonomia,’ 1794, vol. i. p. 148.]
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[ Mrs. Oliphant, in her novel of ‘Miss Majoribanks,’ p. 362. All this reacts on the brain, and prostration soon follows with collapsed muscles and dulled eyes. As associated habit no longer prompts the sufferer to action, he is urged by his friends to voluntary exertion, and not to give way to silent, motionless grief. Exertion stimulates the heart, and this reacts on the brain, and aids the mind to bear its heavy load.]
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[ See the evidence on this head in my ‘Variation of Animals and Plants under Domestication,’ vol. i. p. 27. On the cooing of pigeons, vol. i. pp. 154, 155.]
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[ ‘Essays, Scientific, Political, and Speculative,’ 1858. ‘The Origin and Function of Music,’ p. 359.]