It is a finer stimulous than wine, electricity or massage, and we are on the verge of great therapeutic discoveries concerning it. Some years ago a London surgeon, by using the sun’s rays (presumably with a lens), removed a wine mark from a lady’s face, and destroyed a malignant growth in the same way. Says Dr. Thayer, of San Francisco: “During a practice of more than a quarter of a century I have found no caustic or cautery to compare with solar heat in its beneficial results. Unlike other caustics, it can be applied with safety on the most delicate tissues and the system receives this treatment kindly. The irritation and inflammation following are surprisingly slight and of short duration, the pain subsiding immediately on removal of the lens. There is a curative power in the chemical rays of the sun yet unexplained.” Women especially need to make systematic trial of the sun’s healing and rejuvenating rays. The woman who wants a cheek like a rose should pull her sofa pillows into the window and let the sun blaze first on one cheek and then on the other, and she will gain color warranted not to wash off. Thus it will be seen that the curative properties of sunlight are in nowise overestimated, but in cases of sickness its beneficial action is purely supplementary. The system must first be thoroughly cleansed by “flushing the colon,” then, the ground work of improvement being laid, Fresh Air and Sunlight will prove themselves worthy and efficient colleagues in the task of restoring health. Singly, each is of intrinsic value, but inadequate to cope with disease single-handed (although they may mitigate it), but combined they form a Trinity so powerful that disease can never successfully oppose them. The other two factors in Nature’s great Health curriculum, namely, Exercise and Diet, will be considered under separate headings. PART VI. EXERCISE. Motion is life. The health of both body and mind depend upon it. Inaction means stagnation, a condition fatal to health. Hence the necessity of exercise. As before stated, disuse is as fatal to a piece of machinery as excessive use; in fact, it is far more likely to rust out than to wear out. Activity is essential to life and health and can never be prejudicial, provided that moderation is observed and the muscular system not strained or overworked.