The different effects which different acids have upon the human nutrition, are due to the constitutional needs peculiar to each individ ual. The acid of vinegar is catabolic or disorganizing - that of lemon is anabolic, constructive. The former is a spade, for the purpose of excavating used up, and worthless, material - (oxidation or acidulation downward, in the series of evolution) - the latter is a trowel, by which new material is wrought into constructive forms - (oxidation proceeding upward, in the scale of progressive existence). Or, in terms of practical application: - to a person of the lymphatic, sluggish temperament, burdened with fatty tissue, and with a diet overcharged with animal grease and heavy proteids, in the form of pork, beans, cheese, eggs, etc., - vinegar should take the place of lemon in his mayonnaise and other dressings. On the other hand, the person of nervous and high-strung temperament, with a diet largely consisting of carbo-hydrates - (the almost meat free diet) - should avoid vinegar in any form of food-combination, and take his acid invariably from the lemon juice.

Except as salad dressing, when its nature is thoroughly neutralized by the emulsification with oil, acid should never be used in combination with food. Free acid - in the form of lemon or vinegar - has the power to arrest the hydrochloric acid of the gastric secretion, and hence, if taken in connection with food, interferes seriously with the chemistry of digestion and assimilation. Thus with the exception of its amalgamated or emulsified form, acid should only be used as a beverage, diluted freely with water (one-half lemon to one glass of water) and used only at a time when the stomach is empty - early in the morning or late at night, and at least one and a half hours before any subsequent eating. By its disinfecting and germicidal properties - if taken in this form - lemon-juice is of the greatest healing and restorative value to the stomach, liver and kidneys; while, furthermore, its power to act as a solvent on the calcarious, carbonacious and fatty acid-deposits of the blood-vessels and general tissues of the system, renders the juice of the lemon one of the most important and constitutionally restorative agents of nature's pharmacopoeia.