THE TRACHEA AND LUNGS 



123 



FIG. 148. SECTION OF PART OF OAT'S LUNG, STAINED WITH NITRATE OF SILVER. 

 (Highly magnified.) 



The small granular and the large flattened cells of the alveoli are shown. In the middle is a 

 section of a lobular bronchial tube, with a patch of the granular pavement -epithelium 

 cells on one side. 



FIG. 149. SECTION OF INJECTED T.T-NG, INCLUDING SEVERAL CONTIGUOUS ALVEOLI. 

 (Highly magnified.) 



a, a, free edges of alveoli ; c, c, partitions between nei?hbouring alveoli, seen in section ; 

 6, small arterial branch giving off capillaries to the alveoli. The looning of the vessels to 

 either side of the partitions is well exhibited. Between the capillaries is seen the homo- 

 geneous alveolar wall with nuclei of connective-tissue corpuscles, and elastic fibres. 



