550 



APPENDIX. 



wide tub, the aorta measuring a foot in diameter. 

 When we consider these as applied to the circula- 

 tion, and figure to ourselves, that probably ten or 

 fifteen gallons of blood are throM^n out at one 

 stroke, and moved with an immense velocity 

 through a tube of a foot diameter, the whole idea 

 fills the mind with wonder. 



The veins, I believe, have nothing particular 

 in their structure, excepting in parts requiring a 

 peculiarity, as in the folds of the skin on the 

 breast in the Piked Whale, where their elasticity 

 was to be increased. 



The lungs are two oblong bodies, one on each 

 side of the chest, and are not divided into smaller 

 lobes, as in the human subject. They are of con- 

 siderable length, but not so deep between the 

 fore and back part as in the quadruped, from the 

 heart being broad, flat, and of itself filling up the 

 fore part of the chest. They pass farther down on 

 the back than in the quadruped, by AV^hich their 

 size is increased, and rise higher up in the chest 

 than the entrance of the vessels, coming to a 

 point at the upper end. From the entrance of 

 the vessels they are connected downwards, along 

 their whole inner edge, by a strong attachment 

 (in which there are in some lymphatic glands) to 

 the posterior mediastinum. The lungs are ex- 

 tremely elastic in their substance, even so much so 

 as to squeeze out any air that may be thrown into 

 them, and to become almost at once a solid mass, 

 having a good deal the appearance, consistence, 

 and feel of an ox's spleen. The branches of the 



