DIETETIC.--Pertaining to the diet. DUCT.--A tube which conveys the secretion from a gland. EMBRYO.--The offspring before it has assumed the distinctive form and structure of the parent. ENEMA.--A quantity of fluid injected into the rectum. ENGAGEMENT.--The entrance of the fetus into the birth-canal. ETHNOLOGY.--The science which deals with the character, customs, and institutions of races of men. EUGENICS.--The science which deals with the improvement of the human race by better breeding. (Davenport.) EXCRETION.--Waste substance thrown off from the body. FEBRILE.--Attended with fever. FETUS.--The unborn child after the third month of development. FOOD-STUFF.--Anything used for the sustenance of man. FUNCTION.--The discharge of its duty by any organ of the body. GASTRIC JUICE.--The digestive fluid secreted by the wall of the stomach. GERMINAL CELLS.--The structural units from which a new individual takes origin. The cell contributed by the mother is called an egg- cell or ovum; that contributed by the father, a spermatozoon. GESTATION.--Same as pregnancy. GLAND.--An organ which separates certain substances from the blood, and pours out a material, usually fluid, peculiar to itself. HYGIENE.--That department of medical knowledge which relates to the preservation of health; sanitary science. INANITION.--The condition which results from insufficient nourishment. INFECTION.--A disease due to bacteria. INTESTINE.--The bowels; the long membranous tube extending from the stomach to the rectum. INVOLUTION.--The process by which the uterus returns after child- birth to its former size and position. LACTATION.--The secretion of milk. LIGAMENT.--A band of tissue serving to bind one part of the body to another. LIGATURE.--Anything that serves for tying a blood-vessel. LOCHIA.--The discharge continuing for several weeks after the birth of a child. LOTION.--Any liquid holding in solution medicinal substances intended for application to the skin. LUNAR MONTH.--A month of twenty-eight days. MAMMAL.--The highest order of animal, namely, one which suckles its young. MAMMARY.--Relating to the breast. MASTICATION.--The act of chewing. MENOPAUSE.--The permanent abolishment of the menstrual process, which generally occurs between the 45th and the 50th years. MICRO-ORGANISMS.--Bacteria and other living agents of disease which are visible only with the aid of the microscope. MISCARRIAGE.--The termination of pregnancy prior to the seventh month. MUCOUS MEMBRANE.--The lining of certain cavities of the body, such as the mouth, stomach, intestine, uterus, etc. MUCUS.--The material manufactured by the glands in a mucous membrane. MUSCLE-FIBERS.--The muscle-cells. NARCOTICS.--Drugs which produce sleep. NITROGEN.--One of the chemical elements. NUCLEUS.--A clearly defined area found in every cell which seems to be its seat of government.