726 



THE RESPIRATORY TRACT. 



which is followed by stagnation in the vessels of the lungs. 

 Hypertrophy or hyperplasia of the lungs is often connected with 

 emphysema. The new formation of connective tissue is well 

 marked around the larger blood-vessels, both arteries and veins, 

 more especially around the former. A rust-brown pigmentation 

 is, as a rule, found in the augmented connective tissue, evidently 

 due to a former extravasation of blood. (See Fig. 326.) 



FIG. 325. ACUTE MILIAR.Y TUBERCULOSIS OF THE LUNG. 



F, uiiliary tubercle ; CA, compressed alveolus ; DE, detached epithelia of the alveolus ; E, 

 emphysematous alveoli ; C, capillaries overlapping the tubercle; PV, pulmonary vein. Mag- 

 nified 100 diameters. 



(d) Suppurative pneumonia invades either the whole or large 

 portions of the lung-tissue in a manner similar to that of croup- 

 ous pneumonia ; or it appears in scattered foci, caused by embol- 

 ism, in pyaemia. The distinguishing feature under the microscope 



