Vlll CONTENTS. 



PA.OE 



Acinous Glands . . . . . . . . . 41 



False Vocal Cords . . . 42 



True Vocal Cords 43 



Vessels and Nerves of the Larynx . ... . . . .45 



(6) TRACHEA. 



Framework . . . . . . . . .46 



Mucous Membrane of Trachea . ... . . . .46 



Submucous Tissue . . . . . . . . .47 



Muscular Layer . . . ... . . . .47 



Acinous Glands . ... . . . . .47 



Vessels . ...... 48 



CHAPTEK XX. 



THE LUNGS. 

 BY FEANZ EILHARD SCHULZE. 



1. General Structure of the Lungs of Mammals . . .49 

 Alveolar passages ......... 50 



Alveoli .......... 51 



Bronchia .......... 52 



External Fibrous Layer and Cartilages . . .53 

 Mucous Glands ....... 54 



Muscular Layer . . . . . . .55 



Internal Fibrous Layer . . . . . .55 



Ciliated Epithelium 56 



Cup or Goblet Cells . . . . . .56 



Capillary Plexuses . . . . . . .58 



Lymphatics . . ... . . -.58 



Nerves . . . . . . . . .58 



Alveolar Tissue . ... . , . . .58 



Pulmonary Capillaries ........ 61 



Lymphatics of the Alveoli ....... 63 



Epithelium of the Alveoli ....... 63 



Pigment . . 66 



2. General Structure of the Lungs of Birds . . . .68 



3. General Structure of the Lungs of Pteptiles and Amphibia . 72 



4. Pulmonary Organs of Fishes . . . . . .78 



