CHAP. II.] DEBILITY. — THE WINDPIPE. 101 



his wind," suffers much pain at the commencement 

 of a journey, and subsequently, if pushed hard, dies 

 of locked jaw, through excessive suffering. Dis- 

 orders of this nature were hitherto unknown to far- 

 riers of any description, being mistaken for the worms 

 by every one who has written a book upon horse 

 diseases ; and, by the most eminent veterinary 

 author of modern times, the last stages of this mal- 

 conformation are vaguely noticed by the erroneous 

 terms of " debility" and "general debility," which 

 may mean, any thing amiss. Lentor, or slow fever, 

 however, is the more immediate consequence, as 

 mentioned higher up, in section 28. 



33. The wind-pipe, as its name imports, is the 

 pipe or tube for conveying to the lungs the air 

 which every act of inspiration draws through it ; 

 extending from the mouth to the lungs or lights. 

 At their conjunction, this tube divides into two 

 branches, one penetrating to near the bottom of 

 each lobe s and these again having a dozen perforations 

 apiece in their sides, innate an infinite number of 

 little tubes, or cells, which compose the lungs, much 

 in the fashion of sponge. Except eight blood- 

 vessels, which enter the horse's lungs, the intervals 

 are filled with cellular membrane, and these being 

 also connected with the same kind of membrane in 

 all other parts of the body, accounts for a pheno- 

 menon we shall take occasion to notice shortly 

 {sect. 34), in the case of a blown horse. 



At its upper end, the wind-pipe is composed of 

 strong cartilaginous plates, connected together by 



f3 



