HOOPER. 



103 



tubes go off, one to each lobe of the lungs. This singular 

 structure will be further understood by a reference to the 

 vignette, where a portion of one side of the keel is removed 

 to show the convoluted tube within. 



The depth of the insertion is not, however, so considerable 

 in females or young males. 



In a very young Hooper that died at the Garden when 

 only two or three days old, and which I examined with care 

 to ascertain the state of these various parts at that age, I 

 found the tube of the trachea quite soft and flexible, but de- 

 scending to the level of the anterior portion of the keel, then 

 curving upwards, but exterior to the keel and passing back- 

 Avards into the body, giving off the branchial tubes from the 

 then cartilaginous point of divarication. The keel was hol- 

 low, but the cavity was filled up with a fatty matter, having 

 very much the consistence of marrow, ready to be absorbed 

 when the cavity was wanted. 



