TABLE OF CONTENTS. 



Diflferential Characters in the Organ8 annexed to the Abdonainal Portion of the 



Digestive Canal in the other Animals ..... 508 

 Comparison of the Organs annexed to the Abdominal Portion of the Digestive 



Canal of Man with those of Animals ..... 510 



Chapterlll.— The Digestive Apparatus of Birds . . . .511 



BOOK III. 



RESPIRATORY APPARATUS. 



Chapter I.— Respiratory Apparatus in Mammalia ... 517 



The Nasal Cavities ...... c . 517 



1. The Nostrils ....... 518 



2. The Nasal Fossae .... . . 519 



3. The Sinuses ..... , . 524 

 DifTerential Characters in the Nasal Cavities of the other Animals . . 526 



Comparison of the Nasal Cavities of Man with those of Animals . 527 



The Air- tube succeeding the Nasal Cavities ..... 527 



1. The Larynx ........ 527 



2. The Trachea ....... 536 



3. The Bronchi ........ 539 



Differential Characters in the Air-tube succeeding the Nasal Cavities in the 



other Animals ........ 541 



Comparison of the Larynx and Trachea of Man with these Organs in the 



Domesticated Animals ....... 542 



The Thorax ......... 542 



Differential Characters in the Thorax of the other Animals . . 545 



The Lungs ......... 546 



Differential Characters in the Lungs uf the other Animals . . 552 



Comparison of the Larynx, Trachea, and Lungs of Man with those of Animals . 553 



The Glandiform Bodies connected with the Respiratory Apparatus . 554 



1. The Thyroid Body or Gland . . . . . .554 



2. The Thymus Gland ....... 555 



Differential Characters in the Glandiform Bodies annexed to the Respiratory 



Apparatus in the other Animals ...... 556 



Comparison of the Glandiform Bodies annexed to the Respiratory Apparatus 



in Man with those of Animals ...... 557 



Chapter II.— The Respiratory Apparatus of Birds . . .557 



BOOK IV. 

 URINARY APPARATUS. 



1. The Kidneys 568 



2. The Ureters ........ 574 



3. The Bladder 575 



4. The Urethra . . . . . . . . 578 



5. The Supra-renal Capsules ...... 578 



Differential Characters of the Urinary Apparatus in the other Animals . 579 



Comparison of the Urinary Apparatus of Man with that of Animals . 581 



BOOK V. 

 CIRCULATORY APPARATUS. 



rlRST SECTION.— THE HEART . .... 583 



1. The Heart as a Whole ...... 583 



2. External Conformation of the Heart ..... 584 



3. Internal Conformation of the Heart ..... 587 



