Instinct. That quality in man or animals which prompts the doing of things independently of any direct knowledge or understanding. Intermediate. Between; that which may be within or inside the scope of the mind, or of certain areas. Intervening. The time between; also applied to the action of a person who may take part in an affair between two or more persons. Interval. A time between. Investigator. One who undertakes to find out certain things. Incidence. In physics this is a term to indicate the line which falls upon or strikes another at an angle. Inverted. Upside down. Invest. To give to another thing something that it lacked before. Kinetic. Consisting in or depending upon motion. Laminated. Made up of a plurality of parts. When wooden strips, of different or of the same kinds are glued and then laid together and put under heavy pressure until thoroughly dried, the mass makes a far more rigid structure than if cut out of a single piece. Launchiug. The term applied to the raising, or starting of a boat, or of a flying object. Lateral. In mining this is a term to indicate the drifts or tunnels which branch out from the main tunnel. Generally it has reference to a transverse position or direction,--that is, at right angles to a fore and aft direction. Lift. The vertical motion, or direction in an airship; thus the lift may be the load, or the term used to designate what the ship is capable of raising up. Ligament. The exceedingly strong tendons or muscles of birds and animals, usually of firm, compact tissues. Limitations. Within certain bounds; in a prescribed scope. Longitudinally. Usually that direction across the longest part. Majestically. Grand; exalted dignity; the quality which inspires reverence or fear. Manipulate. To handle; to conduct so that it will result in a certain way. Maneuver. A methodical movement or change in troops. Manually. To perform by hand. Manifestations. The act of making plain to the eye or to the understanding. Manually-operated. With the hands; a term applied to such machines as have the control planes operated by hand. Maintained. Kept up; to provide for; to sustain. Material. The substance, or the matter from which an article is made; also the important thing, or element. Mass. In physics it is that which in an article is always the same. It differs from weight in the particular that the mass of an article is the same, however far it may be from the center of the earth, whereas weight changes, and becomes less and less as it recedes from the center of the earth. Margin. The edge; the principal differecee between this word and edge, is, that margin has reference also to a border, or narrow strip along the edge, as, for instance, the blank spaces at the edges of a printed page. Medievral. Belonging to the Middle Ages. Mercury. A silver-white liquid metal, usually called quicksilver, and rather heavy. It dissolves most metals, and this process is called amalgamation.