GLOSSARY 283 



Element. A substance which is composed of nothing else; an original 

 form of matter. \'lln. 



Emulsion. A more or less permanent and diffusible combination of 

 oils or fats and water. 396, 396a. 



Energy. Power ; force. Every moving, changing or vibrating body or 

 agent expends energy or force ; and this force is transferred to 

 some other body or form, for nothing is lost. The energy of sun- 

 light is expressed in heat, light, and other ways. The energy 

 that is required to produce the food is expended as bodily heat, 

 muscular or nervous energy, and in other ways. 



Entomology. Science of insects. 



Environment. The surroundings of an animal or plant, the conditions 

 in which it lives. Comprises climate, soil, moisture, altitude, 

 etc. 166. 



Erosion. Wearing away; denudation. 



Evolution. The doctrine that the present kinds of plants and animal* 

 are derived, or evolved, from other previous kinds. 



Excretion. A secretion which is of no further use to the animal or 

 plant, and which is thrown off ; as sweat. 363. 



Extraneous. External ; from the outside ; foreign to. 54, 59. 



Extrinsic. Secondary, external, from the outside. The apple has 

 extrinsic value, that is, it is valuable as a marketable or money- 

 getting article, aside from its value as nourishment. See intrinsic. 



Eye. A. bud ; a cutting of a single bud. 235. 



Farm-practice. The management of the farm ; the practical side of 

 farming. It comprises the handling of land, tools, plants, ani- 

 mals. 11. 



Farmstead. A farm borne or establishment. 



Feeding standard. The ideal amount and quality of food for a given 

 purpose. 464. 



Fermentation. The process by means of which starch, sugar, casein, 

 and other organic substances are changed or broken down, and 

 new combinations made. It is usually attended with heat and the 

 giving off of gas. 



Fertility. Ability of the land to produce plants. 105. 



Filter. Elongated or string-like tissues. 



Fibrin. An insoluble but digestible albuminoid. It is present in 

 blood-clots. 



Flocculate. To make granular or crumbly. 58n. 



Fodder. Food for animals. 428. 



Foraye. 1'lants which are fed to animals in their natural condition, or 

 when merely dried. 330. 



