CHAPTER XI. 

 FEVER 



(Pyrexia ). 

 DEFINITION. 



ETIOLOGY. — To.riiis; ptpmaiiis; kalabolic tis.^ue hrodiirl.i ■ ,//»,;{ 

 PERIOD.S OR STAGE.S' (Course). ■ /■ • 



Onset (Stadium Iiicrementi) . 

 Acme (Stadium Pasligium) . 

 Decline (Stadium Dccrementi). 

 Conz'alescence. 

 VARIETIES, according to 

 Course. 



Regular. 

 Irregular. 

 Duration and leniperalure variation. 

 Ephemeral 

 Continuous. 

 Remittent. 

 Interni'ittent. 

 Seventy. 



Sthenic. 

 Asthenic. 

 SYMPTOMS. 



Chill, diminished secretions, increased li.:-art <\-;ioii ac.d r-sl'iri.tic n, 

 nerzoiisness and restlessness. 

 LESIONS. 



Parencliyinafoiis degeneration, ticinolvsis, lixaliiic degeneration, loss 

 of fat. 



Body lieat is a product of metabolism. The Ijodv licat or 

 temperature of warm blooded animals is practically constant, 

 althougli chang'ed environment, diet and use or occupation pro- 

 duce some \-ariations. Thus a horse confined in a Itarn lias a 

 temperature .5 to 1 F. hiylier than when nut so C(.)nfined, pro- 

 vided the diet is the same in both conditions. A narrow ration 

 is conduci\'e to increased oxidation and consequentl}- a Iiii^lier 

 temperature. Animals in action have a liigher temperature than 

 when at rest. Thus a dog's temperature is from 1 to i' F. higlier 

 immediately after than it is before a chase. 



The accurate regulation of body temperature is accomplished 

 by the action of the thermo-regulating center or centers. Tissue 

 action is always accompanied by increased heat production, and 

 frequently different parts of the same animal ma}- vary 1 to (1 F. 

 in temperature. The eriualization of bofl\- heat and the distribu- 

 tion of heat to the different parts of the body is accomplished 

 by means of the circulating blood. Heat is continually produced 

 in the animal body and is constantly eliminated from the bo(h' 



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