. Human and comparative anatomy, physiology, and hygiene . s down of the body. (Figs. 2, 3.) Q. What systems are classed under the nutritive apparatus ? CHAPTER I. 28. The digestive system will be described in thischapter. It embraces the teeth, sali-va-ry glands,stomach, small in-testine, liver, pancre-as, (sweetbread,)lacte-als, and large in-testine. (Figs. 2, 3, 20.) Q. How is the digestive system divided? Lesson I. 29. In a flouring mill there are burr stones. By therapid motion of one stone upon the other, wheat andother grains are crushed and made fine ; so the teeth, bythe movement of t
. Human and comparative anatomy, physiology, and hygiene . s down of the body. (Figs. 2, 3.) Q. What systems are classed under the nutritive apparatus ? CHAPTER I. 28. The digestive system will be described in thischapter. It embraces the teeth, sali-va-ry glands,stomach, small in-testine, liver, pancre-as, (sweetbread,)lacte-als, and large in-testine. (Figs. 2, 3, 20.) Q. How is the digestive system divided? Lesson I. 29. In a flouring mill there are burr stones. By therapid motion of one stone upon the other, wheat andother grains are crushed and made fine ; so the teeth, bythe movement of the lower upon the upper jaw, cut,crush, and make fine the solid part of the food. Q. To what may the teeth be compared ? What is the use ofthe teeth ? 2 (1J) 14 ANATOMY, PHYSIOLOGY, AND HYGIENE. TEETH. * SO. The teeth are connected with the jaw by thesockets, (al-veo-lar processes.) Q. How are the teeth connected with the jaw 1 31. The sockets are covered, and the neck of theteeth is surrounded, by a firm membrane called gum. Q. What is the gum ? Fie. Fig. 4 represents the milk teeth from the left side of the jaw. 1, teeth, (incisors.) 3. Eye tooth, (cuspid.) 4, 5. Grinders,(molars.) 32. Children have twenty teeth, which are called the * To illustrate this lesson, use the jaws and teeth of different ani-mals ; as the ox, horse, squirrel, as well as man, with drawings uponthe blackboard. (See Preface.) TEETH. 15 milk teeth. These ^£© generally removed before the child is eight years old. (Fig. 4.) Q. How many teeth has the child ? What are they called ?When are they removed ? Observation. — Calves, lambs, and colts have milkteeth, that are removed early like human teeth. Q. What is said of the milk teeth of calves, lambs, &c. 33. The adult or fullgrown person has thirty-two,called permanent teeth. (Fig. 5.) Q. How many teeth has a fullgrown person? What arethey called 1 Fig. 5.
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