. A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools . W&^^ Fig. 1. Starch-grains: (1) from the potato, —potato starch-grains; (2) fromwheat, —wheat starch-grains; (3) from oat, — oat starch-grains; (4) cells fromthe surface of a leaf. Cells in the Animal Kingdom. The same thing is trueof the animal kingdom. When we look at a drop ofblood we little think that the microscope would show init vast numbers of minute cells; and yet there are asmany as five millions of them in every drop. Then weloo
. A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools . W&^^ Fig. 1. Starch-grains: (1) from the potato, —potato starch-grains; (2) fromwheat, —wheat starch-grains; (3) from oat, — oat starch-grains; (4) cells fromthe surface of a leaf. Cells in the Animal Kingdom. The same thing is trueof the animal kingdom. When we look at a drop ofblood we little think that the microscope would show init vast numbers of minute cells; and yet there are asmany as five millions of them in every drop. Then welook at the skin, and think it is one solid mass of cover-ing ; but the microscope shows that it is made up of anumber of layers of cells. 24 A HEALTHY BODY. The Whole Body a Collection of Cells. By means of themicroscope we learn that all the organs and tissues ofthe system are composed of minute bodies, called cells.(Pig. 2.) The Cells are not alike. There are round cells, long, nar-row cells, and cells of all shapes and sizes. Some of. Fig. 2. Cells from different parts of the body, —(1) from the inside of thecheeks; (2) from the liver; (3) from the nail of a finger; (4) from the bronchialtubes; (5) from the intestines; (6) from beneath the skin; (7) from muscle;(8) from the eye; (9) from the stomach. them are so small that it would take three or four thou-sand of them, side by side, to make an incli in length ; CELLS. 25 while others are so large that they can almost be seenwith the unaided eye. Some are colorless, others arelightly colored, and still others are jet black. What is Histology? After we have studied the bodyas far as we are able with the unaided eye, there is stillmuch to be learned by means of the microscope. Micro-scopic anatomy, or histology, is a description of theminute structure of animals or plants. 26 A HEALTHY BODY. CHAPTER V. THE BONES. The Frame-work. In building a house it is necessarythat there should be a strong frame-work ; for on thiswill
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