Man frequently speaks of his “five senses”, although scientists discovered long ago that there are several other senses besides those of sight, hearing, smell, taste, and touch, and that we possess special organs for each of them, just as we have eyes for seeing and noses for smelling. Our sense of balance which keeps us upright even when our eyes are closed is a case in point. Another is the sense of temperature, which has its special perceptor organs situated in our skin, and which conveys to us a sensation of hot or cold, clearly differentiated from what is popularly called “feeling”, or sense of touch.
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