Fig. 20. 



From a section through the lung of a guinea-pig dead of subacute plague, 

 showing a nodule with masses of plague bacilli (dark). x 85. 



Fig. 21. 



From a section through the lung of a guinea-pig dead of subacute plague, 

 showing a nodule the centre of which is the alveolar duct and corresponding 

 alveoli, all filled with plague bacilli (dark). x 100. 



