270 AVES. 



side, besides the centre lobe ; and on the left side only one lobe. The 

 jugular and subclavian vein on the left side form a left vena cava 

 superior. 



[Class Aves. 



Order Eaptores 1 .] 



The birds of this order live principally upon animals ■which they 

 catch and kill, and are generally obliged to eat or swallow the hair or 

 feathers, especially of those "which are very small, such as mice or the 

 smaller birds ; but more especially the first ; they are also obliged to 

 swallow the bones of such food. These parts of animals are indigest- 

 ible ; and therefore must either pass along with the other excrementi- 

 tious matter, or be thrown up by the mouth : this last way is that 

 which is used. Those of the eagle-kind, I believe, first kill their food 

 by their claws, and then begin to pluck the feathers, if it is a bird, 

 before they begin to eat; but it is impossible for them to be nice, 

 therefore they are obliged to swallow many of the feathers. If it is a 

 hare or rabbit, they soon begin to open a way into the side or chest, and 

 therefore have less chance of eating the hair. 



The Golden Eagle [Aquila Chrysaetos, Cuv.]. 



He has a swelling in his oesophagus, something like a crop, and has a 

 cavity behind the oesophagus before it becomes glandular. After the 

 third turn of the duodenum it passes down on the right side, becoming 

 immediately loose ; then makes its convolutions, which are scolloped, 



or rather the mesentery, something in this i //// i 1 \ \\ \ / 



form, and becomes a good deal smaller; at f//\ / / ; j \ \ \ C — ' 

 last it passes upon the left side, and is at- \*Z/*\ ]/~N /f\\\\ 

 tached to the posterior part of the stomach ; I U I \ \\ \ v^/ 



from thence it passes down, and makes a ^~^^ \^/ 



loose turn on itself, thrown a little into convolutions, and then forms 

 the rectum. 



The length of the whole intestines is twice the length of the whole 

 animal, and four times the length of the trunk. 



The eye is very large, and upon its lower and anterior surface it does 

 not adhere to the orbit ; and there is a cavity [orbital air-cell, extend- 

 ing] half-round the eye, like the cavity round a stile. This cavity 

 communicates with that which is above the lower jaw, just before and 



1 [The following notes occupied vol. vi. of Hunter's MSS., entitled " Of the 

 Anatomy of Birds."] 



