CHAPTER III. 



liESl'IRATIOX, DKiKSTlON, VOK K, AND SKXSKS OF lUKns. 



The liiiios c)f' birds, unlike those of manuualia, tlo not float freely in the chest, but 

 extend clown the spine, to which they are attached, and till up the hollows between the 

 ribs at their junction with the spine. They are firm in texture, and consist of distin- 

 <i'uishable cells, filling- not only the hollow bones with 'air, but also cavities and nieni- 

 liraneous sacks, which are variously situated, but manifestly designed nioi'e completely to 

 aerate the blood, and to increase the lightness of the body in the surrounding atmos- 

 phere. And thus — 



'• Tlic vital ail' 



Pervades the swavining seas and licaving earths, 



AVhere teeming Nature broods licr myriad births ; 



Fills the tine lungs of all that breathe or bud, 



AVarms the new heart, and dyes the gushing blood ; 



"With life's first s^Kirk ins])ires th' organic frame, 



And as it wastes, renews the subtle flame." 



In glancing at the organs of respiration and voice, it may be observed tliat, in birds, the 

 lipper aperture is at a considerable distance fronr the articidating parts. It is called the 



no. 1«. - oHoANs OK hesi'Ikation and voice. 



iipiicr hiriiux, has its lips innnovcabie, and is not coveivd with un rpiff/nffix. At the bottom of 



the Iriiclirii (r), 111!' point at whiili it branclii s into two, to form tin- hroiir/iin/ inhva (nn), 



