[J] The standard death rate is that experienced by average insurance risks of the same age, according to the Medico-Actuarial Committee. The most favorable mortality (19 per cent. below the average) is found among those aged 57 to 62 who are extremely light in weight, compared with the average weight for those ages. The next lowest mortality in any other age group (15 per cent. below the average) is among those aged 40 to 44 who are 5 to 10 pounds under the average weight. [Sidenote: Diet for Underweight] Thin people lose heat more readily than stout people, as they have a larger percentage of active tissue and expose more skin surface in proportion to the body weight. They require, therefore, an abundant supply of energy food, or fuel foods, fats, starch and sugar. Butter and olive oil are better than other fats and less likely to disturb the digestion. Sugar is a valuable fuel food, but should not be taken in concentrated form into an empty stomach. Sweets are best taken at the end of a meal, but in such cases the teeth should be well cleansed. Fruit at the end of a meal tends to prevent any injury to the teeth from sugar and starches. Potatoes, cereals, bread and all starchy vegetables are fattening, but should be well chewed and tasted before swallowing. Thin, anemic people derive much benefit from egg lemonade or egg-nogs (without alcohol) made from the yolks, which contain fat, iron and other valuable elements. [Sidenote: Exercise for Underweight] Overfatigue and exhausting physical exertion should be avoided. Moderate systematic exercises, with deep breathing, and sleeping out of doors, or approaching as near to it as one can, are advisable. At middle life and after, underweight, unless extreme or accompanied by evidence of impaired health, should not give any concern. Other things being equal, the old motto "A lean horse for a long race," holds good. SECTION III NOTES ON POSTURE [Sidenote: Corrective Exercises for Faulty Posture] Among simple exercises recommended for strengthening the abdominal muscles and restoring the organs to normal position are the following: Lie flat on the back and rise to a sitting posture; squat until the thighs rest upon the calves of the legs. Lie flat on the back, head downward on an inclined plane (an ironing board, uptilted, will do) and make a bridge at intervals by arching the abdomen and resting on shoulders and heels. From the fundamental standing posture described in this section, a number of exercises can be developed. 1. _Yard-arm._--While deeply inhaling (through the nose) slowly raise the arms to horizontal position, straight out from the sides; let the arms fall slowly to the sides while exhaling. The chest should be well arched forward, hips drawn backward and arms hung back of thighs while performing this exercise. These movements should be performed at the rate of about 10 per minute.