Under such a course, severe mental exertion is impossible; and the return to it requires to be gradual. But light exercise with dumb-bells, &c., fresh air, walking, and good food are the conditions of all sound mental work, whether done by man or woman.
For the clerk or bookkeeper closely confined to desk or counter, much the same regimen is needed, with brisk exercise at the beginning and end of the day,--at least always walking rather than riding to and from the office or store; while in all the trades where hard labor is necessary, heartier food must be the rule. And for all professions or trades, the summing-up is the same: suitable food, fresh air, sunlight, and perfect cleanliness,--the following of these laws insuring the perfect use of every power to the very end.
As old age advances, the food-demand lessens naturally. Nourishing food is still necessary, but taken in much smaller quantities and more often, in order that the waning powers of the stomach may not be overtaxed. Living on such principles, work can go on till the time for work is over, and the long sleep comes as quietly as to a tired child. Simple common-sense and self-control will free one once for all from the fear, too often hanging over middle life, of a paralytic and helpless invalidism, or the long train of apoplectic symptoms often the portion even of middle life.
I omit detail as to the character and effects of tea, coffee, alcohol, &c, such details coming in the chapters on the chemistry of food.
Animal food has a wider range than is usually included under that head. The vegetarian who announces that no animal food is allowed upon his table offers a meal in which one finds milk, eggs, butter, and cheese,--all forms of animal food, and all strongly nourishing. A genuine vegetarian, if consistent, would be forced to reject all of these; and it has already been attempted in several large water-cures by enthusiasts who have laid aside their common-sense, and resigned with it some of the most essential forces for life and work. Meat may often be entirely renounced, or eaten only at rare intervals, with great advantage to health and working power, but the dietary for the varied nourishment which seems demanded must include butter, cheese, eggs, and milk.