[L.] A liquid of an alkaline re-action which, secreted by the salivary glands from the blood, moistens the mouth and mixes with the food to help digestion. The salivary glands are excited to pour out saliva by the movement of the jaws in chewing and in talking. Touching any part of the mouth will cause saliva to flow. The sight, smell, or taste of food when one is hungry will " make the mouth water." When food is eaten hastily, and not moistened with saliva, the stomach is disarranged, and indigestion follows. Its action in digestion is due to the presence of ptyalin.