2912. The Second Rule.—In sickness, send for the best physicians; viz., those who give least medicine.
2913. Pure atmospheric air is composed of nitrogen, oxygen, and a very small proportion of carbonic acid gas. Air once breathed has lost the chief part of its oxygen, and acquired a proportionate increase of carbonic acid gas.
2914. Therefore, health requires that we breathe the same air once only.
2915. The solid part of our bodies is continually wasting, and requires to be repaired by fresh substances.
2916. Therefore, food, which is to repair the loss, should be taken with due regard to the exercise and waste of the body.