Hunger: - Theories to explain the Sensation. - Referred by the Author to a peculiar Condition of the Nerves. - Destroyed by Narcotics. - Practice of the Indians to counteract its cravings. - Its connexion with the state of the stomach only Secondary. - Chymification, Chylification, and Sanguification, may be considered as incompatible with each other. - Why an interruption during a Meal destroys the Appetite. - The quality and not the quantity of Food produces satiety. - Thirst:- - Its final Cause. - Its proximate Cause. - General Phenomena of Inanition. - Sanguification attended by a desire of activity. - Of Exercise immediately before and after Meals.