604 Anatomy, Physiology, and Pathology of the 



tion, is their deficiency of the interlobular tissue. Besides the 

 union of the lobules here spoken of, I have also stated that 

 the various component parts of the lungs are held together by 

 interstitial areolar tissue. The network of this tissue is very 

 minute, and when in this disease the red corpuscules of the blood 

 escape from the capillaries by a rupture of their coats, it retains 

 these bodies in its meshes, and assists in producing the dark 

 colour of the isolated patches. This colour likewise depends in 

 part on many of the capillaries being distended almost to bursting 

 by the red corpuscules. The united pressure of the overloaded 

 vessels, and of the infiltrated interlobular and interstitial tissues, 



Fig. 21. 



a. The right lung of the ox, considerably increased in size, and covered here and there with 

 effusions of fibrine. b. The left lung, still retaining its healthy condition. c, c. The 

 yellowish bands which intersect the diseased lung in various directions, being produced by the 

 interlobular tissue surcharged with the fibrino-albuminous portions of the blood. d, d. The 

 dark-coloured patches, arising from a retention of the red corpuscules, &c. 



