114 



of the bodies of the upper lobes to wliicli tliey are 

 attached. They take, we conceive, a double 

 twist, each for the action of its own line, and con- 

 stitute the basis for the connection of the neck- 

 action with that of the central spine, at the quasi 

 ball and socket joint of the " neck root." 



It will be observed that, as the space of the false 

 ribs, ending in a single continuation in front, 

 § 82, is more extended in rear than in front, so the 

 two loicer lobes of the lungs marked out by them will 

 be very much thicker behind than before, while the 

 tivo upper lobes will be somewhat deeper in front 

 thmi in rear. The true and false ribs and the lung 

 lobes thus seem to match in shape as they do in 

 motion. 



§ 113. The lung lobes are filled with air through 

 only one set of tubes ; but where (that is, in 

 what part) they become filled depends upon where 

 a vacuum is created in the chest, by the motions of 

 the ribs and of the diaphragm. Experiment will 

 — so we think — easily show, that m the fillings from 

 the ophidian movement the upper lung lobes fill from 

 the lower part upward ; the loiver lobes from the 

 upper part downward. 



There are two moments of filling for each set of 

 lobes, viz.: for the loiver lobes , when the secondary 



