AQUILA. CHRYSAETOS. 27 I 



a little below the eye ; however, this cavity is divided into two bags, 

 by a thin membranous partition at the inner canthus of the eye, which 

 extends inwards to the bottom of the orbit. The lacrymal [Harderian] 

 gland is placed at the upper and interior part of the eye near the 

 bottom of the orbit, upon the muscles of the eye ; and on the exterior 

 and upper part of the orbit there is a small body [answering to the 

 true lacrymal gland in mammals] which is glandular, but the duct I 

 could not find K The processus ciliares are much longer than in 

 a quadruped's eye of equal size. The vitreous humour of an eagle's 

 eye has plainly a coat, for it is capable of being separated from 

 the humour 2 . The anterior part of the first ventricles in the brain of 

 an eagle passes to [the canal answering to the holes in] the cribriform 

 bone along with the olfactory nerves, which are in this class of animals 

 very short. 



Of the Abdominal Air- Cells. — The lowest, or that which is nearest 

 to the back, is the largest, and is immediately on the outside of the 

 membrane which covers the intestines ; it is bounded by a thin mem- 

 brane going across, the anterior edge of which is attached to the abdo- 

 minal muscles. The inner edge is attached anteriorly to the gall-bladder, 

 and posteriorly to the right of the mesentery, somewhat higher than 

 the above-mentioned, also to the head of the kidney, where it seems to 

 be split into two, one of which is attached to the lower and anterior 

 edge of the lungs. The anterior attachment is to the three lower ribs, 

 and then down to the loins. Into this cell, so formed by these two 

 partitions with the other parts of the abdomen, opens the lower air- 

 hole of the lungs. The second cell is bounded above by the third 

 partition, which is fixed anteriorly to the abdominal muscles, inwardly 

 to the upper part of the foregoing partition, near its anterior part, but 

 posteriorly this inner adhesion is to the root of the mesentery, and to 

 the attachment which the liver has to the back : then the tip or edge 

 runs across the lower surface of the lungs, about their middle, to the 

 ribs, then to the four last ribs between tbis partition and the foregoing. 

 The middle cell communicates with the middle opening of the lungs ; 

 which opening is close to the ribs near the fixtures of the membranes 

 to the ribs. The third or anterior cell is bounded downwards by the 

 last described membrane or partition anteriorly, and superiorly by the 

 fourth membrane. This fourth membrane is attached anteriorly to the 

 inside of the sternum, inferiorly to the last described, and to the basis 

 of the liver; superiorly to the pericardium, and across from that to 



[But see p. 274, ' Bald Eagle.'] 



[Hunt, Preps. Phys. Series, Nos. 1796, 1797.] 



