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.