Of what use is the inner coat of the stomach?--"It prepares a slimy substance and a fluid." Of what use is the slimy substance?--"It prevents the stomach from being irritated by the food." Of what use is the fluid?--"It dissolves the food." What do you mean by slimy?--"Soft, moist, and sticky." What do you mean by irritate?--"To produce unhealthy action." What do you mean by dissolves?--"Melts." Where is the food changed after it is taken into the mouth?--"First it is changed in the mouth; second, it is changed in the stomach; third, it is changed after leaving the stomach; fourth, it is changed in the lungs." By what is it changed in the mouth?--"By the action of the teeth and the saliva." By what is it changed in the stomach?--"By the action of the stomach and a kind of fluid called gastric juice." By what is it changed after leaving the stomach?--"By the action of the bile and the pancreatic juice." By what is it changed in the lungs?--"Nobody knows." Into what is it changed in the mouth?--"Into pulp." Into what is it changed after leaving the stomach?--"Into chyle and waste substance." Into what is it changed in the lungs?--"Into blood." What is the change in the mouth called?--"Mastication, or chewing." What is the change in the stomach called?--"Chymification, or chyme-making." What is the change after leaving the stomach called?--"Chylification, or chyle-making." What is necessary, if you would have a healthy stomach?--"I must be careful what kind of food I eat; how much I eat; and when I eat." What kind of food must you eat?--"Wholesome food, etc." See Formula. How much must you eat?--"Enough, but not too much." How must you eat?--"Slowly." How should your food be masticated?--"Thoroughly." When must you eat?--"Regularly, but not too often." When should you avoid eating?--"Just before bedtime." What kind of air should you breathe?--"Pure air." How should you sit, stand, and walk?--"Erect." Why should you not eat too much food?--"Because, if I eat too much food, my stomach will have too much work to do in changing it into chyme." Why should you eat slowly?--"That I may have time to masticate the food thoroughly." Why should you masticate your food thoroughly?--"That it may be well prepared to enter the stomach." Why should the food be well prepared to enter the stomach?--"Because, if it is not well prepared in the mouth, the stomach will have too much work to change it into chyme." Why should you eat regularly, but not too often?--"Because the stomach needs rest, which it cannot have, if I eat too often." Why should you avoid eating just before bedtime?--"Because, while I am asleep, the stomach cannot do the work of changing the food as it ought to be changed; because the stomach should rest with the other parts of the body." Why should you breathe pure air?--"Because pure air helps to make pure blood, which the stomach needs to make it strong and healthy."