GLOSSARY 337 



Croup : the top of the hips. 



Culture: the art of preparing ground for seed and raising crops by 



tillage. 

 Curb disease : a swelling on the back part of the hind leg of a horse 



just behind the lowest part of the hock joint. It generally causes 



lameness. 



Curculio : a kind of beetle or weevil. 



Dendrolene: a patented substance used for catching cankerworms. 

 Digestion: the act by which food is prepared by the juices of the 



body to be used by the blood. 

 Dormant : a word used to describe sleeping or resting bodies, bodies 



not in a state of activity. 

 Drainage : the process by which an excess of water is removed from 



the land by ditches, terraces, or tiles. 



Element : a substance that cannot be divided into simpler sub- 

 stances. 



Ensilage : green foods preserved in a silo. 

 Evaporate : to pass off in vapor, as a fluid often does ; to change 



from a solid or liquid state into vapor, usually by heat. 

 Exhaustion: the state in which strength, power, and force have been 



lost. When applied to land, the word means that land has lost 



its power to produce well. 

 Fermentation : a chemical change produced by bacteria, yeast, etc. 



A common example of fermentation is the change of cider into 



vinegar. 

 Fertility : the state of being fruitful. Land is said to be fertile when 



it produces well. 

 Fertilization : the act which follows pollination and enables a flower 



to produce seed. 

 Fetlock: the long-haired cushion on the back side of a horse's leg 



just above the hoof. 

 Fiber : any fine, slender thread or threadlike substance, as the rootlets 



of plants or the lint of cotton. 

 Filter: to purify a liquid, as water, by causing it to pass through 



some substance, as paper, cloth, screens, etc. 



Formalin : a forty per cent solution of a chemical known as formal- 

 dehyde. Formalin is used to kill fungi, bacteria, etc. 



