THE RESPIRATORY SYSTEM. 



1 59 



FIG. 83. PHOTOGRAPH OF A LUNG CORROSION OF A PUMA IN MORPHO- 

 LOGIC MUSEUM OF PRINCETON UNIVERSITY. The specimen was pre- 

 pared by Mr. Sylvester. The trachea with all its ramifications was 

 injected with white paraffin, and the pulmonary artery with red 

 paraffin, after which the lung substance was eaten away with acid. 



tr, Trachea ; br, bronchus ; b, bronchial tube ; c, bronchiole. The pul- 

 monary artery and its branches are much darker than the air tubes. 



