“One of his children, a girl, has inherited the same trick. She performs it, likewise, with the right hand, but in a slightly modified form; for, after raising the arm, she does not allow the wrist to drop upon the bridge of the nose, but the palm of the half-closed hand falls over and down the nose, striking it rather rapidly. It is also very intermittent with this child, not occurring for periods of some months, but sometimes occurring almost incessantly.”]
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[ Prof. Huxley remarks (‘Elementary Physiology,’ 5th edit. p. 305) that reflex actions proper to the spinal cord are natural; but, by the help of the brain, that is through habit, an infinity of artificial reflex actions may be acquired. Virchow admits (‘Sammlung wissenschaft. Vorträge,’ &c., “Ueber das Rückenmark,” 1871, ss. 24, 31) that some reflex actions can hardly be distinguished from instincts; and, of the latter, it may be added, some cannot be distinguished from inherited habits.]
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[ Dr. Maudsley, ‘Body and Mind,’ 1870, p. 8.]
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[ See the very interesting discussion on the whole subject by Claude Bernard, ‘Tissus Vivants,’ 1866, p. 353-356.]
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[ ‘Chapters on Mental Physiology,’ 1858, p. 85.]