The brain gets a copious blood supply, yet the hardening of the arteries often deprives this organ of its necessary nourishment. Then the higher faculties begin to abdicate. If the hardening is extensive senile softening of the brain may take place. This is always due to a lack of pure blood. Sometimes the arteries are brittle enough to break. Baldness is another symptom of physical decay. The hair follicles are not properly nourished, for the arteries have become so contracted and the tissues of the scalp so hardened that there is not enough blood to feed the hair roots. Baldness begins on top of the head, generally the only part affected, because it is farthest away from the blood supply. Baldness is also partly due to man's headwear. Women are rarely bald. There is a saying that there are no bald men in the poorhouse. Even if this were true, it would not be very consoling, for the bald heads on the street cleaning forces are numerous. Overeating also causes premature aging because if results in fermentation in the alimentary tract. The acids produced cause degeneration of various tissues, having an especially bad effect on the nervous system, which reflects the evil to other parts of the body. It is well to bear in mind how this comes about: First there is overeating; too much food improperly prepared is taken into the blood stream; this makes the blood impure; deposits, causing hardening of the tissues and reduction of the lumen of the vessels, are formed; the blood grows more impure and the circulation sluggish; the tissues are constantly bathed in impure blood, causing further degeneration. When a certain point is reached nature can tolerate no more and life flits away. Those who wish to remain young must give some thought to the selection of their food, especially if they are hearty eaters. If only sufficient food is taken to keep the body well nourished it does not make much difference what is eaten, provided it contains sufficient of fresh foods, for when only enough food is taken to supply fuel and repairing material, the food will all be used and none is left to ferment in the digestive tract and form deposits in the body. The body will then keep itself clean, or at least the formation of deposits takes place so slowly that it is hardly perceptible. This can be compared with the process taking place in the flues of a boiler. Stoke properly and they remain clean. Choke the firebox with an excess of coal and the combustion is so incomplete that the flues are soon filled up and the grates are often burned out. Just so with the body: Feed too heavily and the digestive organs are burned by the abnormal amount of acid produced and the blood-vessels are filled with debris.