63 
independent of that which produced changes in the 
blood by the pulmonary circulation. 
The throat did not form an open receptacle, hang- 
ing as a continuation of tegumentary covering of 
the under jaw like that in the pelican, but was 4 
clesed sack, having no perceptible communication 
-with the mouth and was capable of being filled or 
discharged by a rapid collapse of the cells into which 
it was divided, This was doubiless effected by the 
large fan-shaped muscle that cqyers the inter-clavi- 
eular air cell, this pouch being, as I think, that eell 
prodigiously enlarged. 
When the cormorant has swallowed a fish too 
large for the gullet, it has the power of inflating tha’ 
throat and by violently shaking the head and twist- 
ing the neck, to force it throuch the passage.’ Inthe 
gannet the capacious oesophagus is similarly capabie 
of being extended by inflation. ‘The pelican super - 
adds to the eapacious cesophague cf the gannet the 
faucial bag. He regulates the distribution of air 
through his system, that he may carry his heavy load. 
The whole cellular tissue, even to the tips of the 
- wings and the end of the fleshy part of the leas, can 
be blown up from the trachee. Air passes into the 
lower mandible immediately from the lungs by the 
cells passing along the neck and throat, and when 
he has swallowed any thing which he does not wish 
to retain, he has the power of blowing it out into 
his throatesack, by a sudden blast, and, by shaking 
his head, to cast it from him. 
_A pelican I had sent me some days ago, wounded 
in the wing and unable to fly, accommodated him- 
