~7. The Trunk.~--The trunk of the body, like the skull, is hollow. Its walls are formed partly by the backbone and the ribs and partly by flesh. A fleshy wall divides the hollow of the trunk into two parts, an upper chamber called the _chest_, and a lower called the _abdomen_. ~8. The Lungs and Heart.~--The chest contains a pair of organs called the _lungs_, with which we breathe. It also contains something which we can feel beating at the left side. This is the _heart_. The heart lies between the two lungs, and a little to the left side. ~9. The Stomach and Liver.~--In the abdomen are some very wonderful organs that do different kinds of work for the body. Among them are the _stomach_, the _bowels_, and the _liver_. There are, also, other organs whose names we shall learn when we come to study them. ~10. Care of the Body.~--We have only begun to study the beautiful house in which we live, and yet have we not learned enough to show us how great and wise is the Creator who made us and all the wonderful machinery within our bodies? If some one should give you a beautiful present, would you treat it carelessly and spoil it, or would you take good care of it and keep it nice as long as possible? Ought we not to take such care of our bodies as to keep them in that perfect and beautiful condition in which our kind and good Creator gave them to us? SUMMARY. 1. The body has a framework, called the skeleton. 2. The skeleton is made up of many different parts, each of which is called a bone. 3. The bones are covered by the flesh. 4. The bones of the head form the skull, which is hollow and contains the brain. 5. A row of bones arranged in the back, one above another, forms the backbone. The backbone has a canal running through it lengthwise, in which lies the spinal cord. 6. The trunk is hollow, and has two chambers, one called the cavity of the chest, and the other the cavity of the abdomen. 7. The chest contains the two lungs and the heart. 8. The abdomen contains the stomach, liver, and many other very important organs. 9. Is it not our duty to take good care of our bodies as we would of some nice present from a friend? CHAPTER IV. OUR FOODS. ~1.~ We all know very well that if we do not eat we shall rapidly lose in weight, and become very weak and feeble. Did you ever think how much one eats in the course of a lifetime? Let us see if we can figure it up. How much do you suppose a boy eats in a day? Let us say two pounds. How much does he eat in a year? There are three hundred and sixty-five days in a year; 365 multiplied by 2 equals 730. So a boy eats a good many times his own weight in a year. How much would a person eat in fifty years?