GLOSSARY 177 



Di-ges'tion, the process of changing food to a liquid which will pass 



through the sides of a capillary and into the blood. 

 Dis-til-la'tion, changing a liquid to steam, and then collecting and 



cooling the steam until it forms a liquid again. It is used in making 



alcohol and in obtaining pure water. 

 Drug, a substance which can affect the body when taken in a small 



quantity. A medicine. 



E. 



En-am'el, the hard outer shell of a tooth. 



Energy (en'er-jy}, force which can be used to make a machine work. 



The energy of the body comes from burning or oxidizing the food. 

 Ep-i-der'mis, the thin outside part of the skin, which has no feeling. 



It is composed of cells of epithelium. 

 Ep-i-the'li-um, the cells which cover the surface of the skin and of 



mucous membranes, and which line the tubes of all glands. 

 E-soph'a-gus, the tube down which food is swallowed. 

 Eustachian (Yu-sta 1 ki-an} tube, the tube leading from the middle ear 



to the throat. It is named after an Italian physician who died 



in 1574. 

 Ex-pi-ra'tion, driving air from the lungs. 



F. 



Faint'ing, losing the senses, with great paleness. It is caused by a 

 sudden weakness of the heart, often due to fright. 



Fe'mur, the thigh bone, reaching from the hip to the knee. 



Fe'ver, a sickness in which the heat of the body is increased. 



Fib'u-la, the bone extending from the knee to the ankle upon the out- 

 side of the leg. 



Fil'ter, a box filled with sand, charcoal, or other porous substance. 

 It takes impurities out of water which is run through it. 



Food, anything which, when taken into the body, can add to its weight, 

 or become oxidized and produce heat and energy. 



G. 



Gan'gli-on, a collection of nerve cells, especially those in the sympa- 

 thetic system. 



Gas'tric juice, the fluid which the stomach forms to digest food, 

 ov. PHYSIOL. (INTER J 12 



