,-n//^; t —Diagram of a Lobule of the Lung. A bronchiole is seen divid- 

 ing nto two branches, one of which runs upward and ends in the lobule. la 

 IVvpoh" 'l'\ ^'""^u °^ i^f^'^dibula. At the left are two infundibula. the 

 aiveoh of which presen their outer surfaces. Next are three infundibula in ver- 



next Jrourihe fir 7'" ' "if^'f °Pf ^"^ '''*° *^" "°°^™°^ passageway. In the 

 nnpn,-n f I ^ "^^"ndibulum shows a pulmonary arteriole surrounding the 

 cC n. I f ^'^°/".«- and the second gives the same with the addition of the 



close capillary network in the wall of each alveolus. Around the fourth group is a 

 deep deposit of pigment, such as occurs in old age, and in the lungs of those who 



"rtet n.h et'f — *'l/''t °!! *^^ '^'•'^'^'^^^^'^ ^-^ - ^--h of "the pulmonar^ 

 artery (blue), bringing blood to the infundibula for aeration. Beginning between 

 the infundibula are the radicles of the pulmonary vein (red), a root of which ^ea 



nutrient blood to the bronchiole. (Gerrish.) 

 R 241 



