2917. The fluid part of our bodies also wastes constantly; there is but one fluid in animals, which is water.
2918. Therefore, water only is necessary, and no artifice can produce a better drink.
2919. The fluid of our bodies is to the solid in proportion as nine to one.
2920. Therefore, a like proportion should prevail in the total amount of food taken.
2921. Light exercises an important influence upon the growth and vigor of animals and plants.