112 
the direct and distal endings of venous trunks, while those from ter- 
minal bronchi are only short branches. 
Having now an understanding of the bronchus and the blood- 
vessels, it will be easy to follow the description of the lymphatics for 
they are closely associated with them. I will take them up in the 
following order. 
1) Lymphatics associated with Bronchi. 
2) bs e , Arteries. 
3) hs a „Nein 
4) a of the Pleura. 
Lymphatics associated with Bronchi. In the bronchi 
the lymphatics form a network with a somewhat long and narrow 
mesh. They diminish in number and size from the hilus to the ter- 
minal bronchi where they end in three small vessels. Beyond the 
terminal bronchus no lymph-vessels are found in connection with the 
air spaces; that is the atria and air-sacs have no lymphatics in their 
walls. From this network of bronchial lymphatics, which lies exterior 
to the network of bronchial blood-vessels, branches pass: 
1) to the pulmonary artery which accompanies the bronchus; 
2) to the veins which arise from the angle where branches are 
given off; 
3) to the veins which arise from the distal extremity of the ter- 
minal bronchus. 
I have never found stomata on the free surface of the bronchial 
mucus membrane as described by Kueın 3), nor so-called lymph-capil- 
laries between the epithelial cells lining the bronchi. 
Lymphatics associated with Arteries. I have stated 
that from each terminal bronchus three lymph-vessels arise; one of 
these three passes to the artery and accompanies it in its course. 
At the point where the artery joins another to form a larger vessel 
the lymph-vessels also unite forming a proportionately larger vessel. 
Not only do we find lymph-vessels passing from the terminal bronchus 
to the artery but we also find lymph-vessels passing to the artery 
from the angle formed by the branching of a bronchus. 
The smaller arteries have but a single lymph-vessel accompanying 
them; this may take a spiral course, but it is not the rule. The larger 
arteries have usually two main lymph-vessels situated opposite to 
3) E. Kırın, Contributions to the normal and pathological Anatomy 
of the Lymphatic System of the Lung. Proc. Roy. Soc. 1874. — The 
Anatomy of the Lymphatic System, Vol. II, London 1875. 
