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Rh See Fig. 2.

When sitting at the desk to write or at the table to eat, one rule holds good: viz., do not have your chair too close to the desk or table. Sit as far back in the chair as you can without your back touching the chair back. Avoid stooping. Incline your body from the hips, not from the waist. Keep your eye (your mental eye) on your backbone. That right; all right. But it is never right (in either a standing or sitting posture) if there is a hump in it.