240 



EFFECTS ON THE LUNGS 



marked irritant effect on the lungs, producing at first congestion 

 of the alveolar capillaries, and afterwards haemorrhagic exudation 

 and consolidation. To the naked eye the lungs present in the 

 early stages a suffused redness. Patches of more intense exuda- 

 tion occur in the apices and edges of the lungs. At a later stage 



FIG. 14. Alveolus from the s;tme preparation as Fig. 13 shown under a high 

 power. Note the polymorpho-nuclear leucocytes, detached alveolar cells, . and 

 congested capillaries. (Bullock and Hill.} 



the congestion passes into typical hepatisation, the lungs sink in 

 water and are of a dark purple colour. The pneumonia is patchy 

 if quickly, and universal if slowly developed. Three days after 

 exposure to the oxygen the alveoli and bronchioles show an 

 exudation containing numberless polymorpho-nuclear leucocytes, 

 cocci, and shed epithelial cells. 



Lorrain Smith found that 180 per cent. atm. 2 killed in 



