Report on the Pathological Anatomy of Pleuro-pneumonia. 175 
Fig. 1. — Showing the Distribution of a Broncho-vascular System and the 
corresponding Territory of part of a Lobe. 
A. Artery. B. Bronchns. V. Vein. P. Pleura. I. Interlobular spaces. The dotted lines 
indicate the course of the lymphatics. (Semi-diagvaphic. Reduced one-half.) 
part in draining the tissue, compared with that taken bj the 
numerous channels in the sheath of the larger broncho-vascular 
systems. 
With regard to the construction of the parenchyma of the 
lung, there are also some peculiarities which deserve special 
note, as they distinguish the lung of the ox from that of 
most other animals. In the bovine tribe a state of affairs 
persists throughout adult life, which is found only in the 
early stages of the development of the lung of man. The 
lobules, or ultimate component parts, are distinct from each 
other, and may be regarded as independent lung units, each 
having its own proper air-tube and blood-vessels, and being 
connected to its neighbours only by some very delicate con- 
nective tissue. This connection can be stretched, by a little 
gentle traction, so as to make the partition between the lobules 
an eighth of an inch in width. A little more forcible traction, 
aided by occasional touches of a scalpel, tears through this 
delicate tissue, so that, with a little care, the lobules may be 
