i8o 



MILLER. 



[Vol. VIIL 



length of the bronchus into the lobule. At this last point, 

 the terminal bronchus, two small veins arise which are formed 

 by the capillaries arising from the bronchial artery. These 

 are on the opposite sides of the terminal bronchus and receive 

 in addition a few small branches from the capillaries of the 

 neighboring air-sacs, and in this way a short but quite large 

 vein is formed which empties itself into the nearest pulmo- 

 nary vein. 



Measurements. 



In surveying the whole lung it was necessary to make many 

 measurements and counts of the different parts in order to gain 

 a clear idea of the ultimate histological unit. The measure- 

 ments are all taken from dogs of about the same size, each 

 weighing about seven kilograms, 

 millimeters. 



The measurements are in 



Air Passages. 



