THE RESPIRATORY SYSTEM 



193 



Fig. 94. — Photograph of a Lung Corrosion of a Puma in Morphologic 

 Museum of Princeton University. The specimen was prepared by Mr. 

 Sylvester. The trachea with all its ramifications was injected with white paraf- 

 fin, and the pulmonary artery with red paraffin, after which the lung substance 

 was eaten away with acid. 



tr. Trachea; hr, bronchus; h, bronchial tube; c. bronchiole. The pulmonary 

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



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