GLOSSARY 179 



Lens, a part of the eye, shaped like a small burning glass. It brings 



light to a point and forms an image of an object upon the back of 



the eyeball. 



Lig'a-ment, the tough bands which bind bones together at joints. 

 Liv'er, the gland above the stomach which forms the bile and changes 



digested food to blood. 

 Lung, a spongy bag from which the red blood cells get air to carry to 



the cells of the body. 

 Lymph, the part of the blood which leaves the capillaries to feed the 



cells. 



Lym-phat'ics, the fine tubes which carry lymph back to the blood. 

 Lymph nodes, small bodies through which lymph flows as through a 



sponge. These can be felt in the groin and neck. They strain 



poisons from the lymph. 



M. 



Malt, barley sprouted and grown until the new shoots are about half an 



inch in length, and then dried. It is used in making beer. 

 Mar'row, the fat from the inside of hollow bones. 

 Me-dul'la, the part of the brain just above the spinal cord. It sends 



orders for the movements of respiration. 

 Mem'o-ry, an action of the brain which can be recalled. 

 Mi'crobes, disease germs. The same as bacteria and germs. 

 Mi'cro-scope, an arrangement of glasses which make small things seem 



large to the sight. 

 Mo'tor nerves, nerves which carry impressions away from the brain, 



and toward the cells of the body. These impressions cause the 



cells either to grow, or to move. 

 Mu'cous mem'brane, the skinlike lining of the inside parts of the 



body which connect with the air. It lines the passages by which 



food and air are taken in. 

 Mu'cus, the. thin slimy fluid which mucous membranes produce. It is 



to the mucous membranes as the sweat is to the true skin. 

 Mus'cle, a collection of cells whose duty is to produce motion. 



N. 



Nar-COt'ic, any drug which will benumb pain and produce sleep, as 



opium. 

 Nerve, a collection of threads which carry messages between the cells 



of the spinal cord or brain and the cells of the body. 



