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Introduction to Literary Chinese - Lesson 10, Text 1

Adapted from the 1927 book by J. Brandt
The Brain
The ancients thought that man's perceptions originate in the heart. But in reality the heart is (only) an apparatus for distributing the blood, and the source of perceptions is in the brain.
The brain substance fills the upper part of the head, and contains innumerable nerves which penetrate throughout the whole body as telegraph wires pass throughout the whole country for the (mutual) transmission of news.
(If) we have to make a move, then an order is given from the brain to the nerves for the direction of the mechanism of the body, the same as the head-office sends telegrams to the branch-offices.
Or when our skin has a sensation of pain or itching or when our ears, eyes, mouth or nose receive a sound, color, taste or smell, our nerves transmit those sensations to the brain, the same as the branch-offices telegraph to the head-office.
During the day's work we exhaust our brain's energy; therefore we must sleep at night in order to restore it.
The child's brain is not completely formed, and (therefore) the period of sleep needs to be long. For the adults the night rest can be limited to eight hours.