626 Our Surroundings 



Fuel oil: A product of petroleum; used as a fuel. 



Fulcrum (furkrwrn) : The support on which a lever turns. 



Fumigation: Disinfection by poisonous fumes or gases. 



Function: The normal action of any organ or set of organs. 



Fungus (fun'gws) : A plant which cannot make its own food but feeds 



on the tissues of other plants. Yeasts, molds, and toadstools are fungi. 

 Fuse: A short piece of metal with a low melting point; used as a safe- 



. guard against too great an electric current. 

 Fusing: The melting and blending together of two or more substances 



when heated. 

 Fusion (fu'zhwn) : The combining of two substances by melting. 



G 



Gall bladder: A bag-like organ attached to the liver, which stores bile. 



Galvanometer (gal-vd-nom'e-ter) : An instrument for detecting an elec- 

 tric current and for measuring its intensity and direction. 



Ganglia (gan'gli-d) : Collections of nerve cells and fibers from which 

 nerves branch out, such as the ganglia of the sympathetic system. 



Gas: A freely flowing fluid, such as air, which tends to expand indefi- 

 nitely to fill any container in which it is confined. 



Gas engine: An engine in which an explosive mixture of gasoline vapor 

 and air is burned in the cylinder itself, the explosion serving to move 

 a piston within the cylinder. 



Gaseous: In the form of gas. 



Gasoline: A very volatile and inflammable mixture of fluid hydrocar- 

 bons obtained from petroleum. Used as a fuel in gas engines. 



Gastric glands: Digestive glands in the walls of the stomach. 



Gastric juice: The chief digestive fluid of the stomach. 



Gelatin: A jelly extracted from animal tissues by boiling. 



General property: A quality which is common to all forms of matter. 



General Science: The science which treats of our surroundings. 



Generator: A machine for changing the energy of motion to electrical 

 energy; a dynamo. 



Genus (je'nws) : A group of related species. For example, the zebra and 

 horse belong to one genus. 



Geology (je-ol'o-j!) : The science which treats of the structure and his- 

 tory of the earth. 



Germicide: A chemical preparation used to kill germs. 



Germinate : To sprout, as does a seed. 



Germs: Common name for bacteria or protozoa which cause disease. 



Glacial deposits (gla'shol) : Material left by glaciers. 



Glacier: A large field or stream of ice and snow moving down a moun- 

 tain slope or over an extended area. 



Glands: Organs which secrete material to be used in the body, such as 

 the salivary glands, or which excrete waste, such as the kidneys. 



Glottis: The opening at the top of the windpipe. 



Glucose (gloo'kos) : A sweet substance used as an adulterant in place 

 of sugar. 



Glycogen (gli'ko-jen) : A form of sugar stored in the liver; used to 

 supply energy for the contraction of muscles. 



Granite: A hard, durable, igneous rock; used for building. 



Granular: Formed of tiny separate grains. 



Grape sugar: A white, crystalline form of sugar of about one-half the 

 sweetness of cane sugar. Found in grapes and other fruits. The diges- 

 tive fluids of the body change starch into grape sugar. 



