3/15 It is important that the air of the rooms in which we live and sleep should be kept very pure by good ventilation. Effects of Bad Food.~--The blood is made from what we eat, and if we eat impure and unwholesome food, the blood becomes impure. We ought to avoid the use of rich or highly-seasoned foods, candies, and all foods which are not nutritious. They not only injure the blood by making it impure, but they cause poor digestion. Plenty of Sleep Necessary.~--If we should take a drop of blood from the finger of a person who had not had as much sleep as he needed, and examine it with a microscope, we should find that there were too few of the little red-blood corpuscles. |