400 The Vascular Supply of the Pleura Pulmonalis 
. 
Fic. 9. From a section 
taken parallel to, and in- 
cluding, the pleura of the 
lung of a horse. Thickness 
of section 200 micra. The 
lymphatics were collapsed 
and difficult to follow. The 
lymphatic represented in 
the illustration was se- 
lected because it followed 
one of the main branches 
of the bronchial artery and 
gave an excellent oppor- 
tunity of showing the large 
size of the bronchial ves- 
sels in the pleura of the 
lung of the horse. In the 
lower portion of the illus- 
tration the thickness of the 
arterial wall is shown in 
outline. B.A.—bronchial 
artery. DL. V.—=lymph ves- 
Sele e500): 
