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The heart has its own little brains, so to speak, small collections of nervous substance which govern its rhythmical motions under ordinary conditions. But these lesser nervous centres are to a large extent dominated by influences transmitted from certain groups of nerve-cells in the brain and its immediate dependencies.
Much of the cruder pathology of alcohol is open to doubt. A great many of the supposed degenerative changes in nerve-cells, which were attributed to it and thought to be irrevocable, are now interpreted otherwise. Chronic alcoholism is looked upon by such foremost students as Dr.
Hearing, from the physiological point of view, is the outcome of a series of processes having their development in a corresponding series of centres, or collections of nerve-cells. The loudness of a tone is, of course, recognized by the ear also, but this is hardly a musical quality proper.
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