VI 



CONTENTS. 



SECTIOX PAGE 



140. Organs of Tmieh in Birds 128 



141. Organ of Taste in Birds 129 



142. Organ of Smell in Birds 130 



143. Organ of Hearing in Birds 133 



144. Organ of Sight in Birds 135 



CHAPTER XVII. 

 DIGESTIVE SYSTEM OF AVES. 



CHAPTER XVIII. 

 ABSORBENT SYSTEM OF AVES. 



151. Absorbents of Birds 



180 



CHAPTER XIX. 

 CIRCULATING SYSTEM OF AVES. 



152. Blood of Birds 184 



153. Heart of Birds 185 



154. Arteries of Birds 189 



155. Veins of Birds 204 



CHAPTER XX. 

 RESPIRATORY SYSTEM OF AVES. 



156. Lungs of Birds 209 



157. Air-cells of Birds 211 



158. Air-passages in Birds 217 



159. Lower larvnx in Birds .......... 220 



CHAPTER XXI. 

 URINARY SYSTEM AND DUCTLESS GLANDS OF AVES. 



160. Kidneys of Birds 226 



161. Adrenals of Birds 229 



162. Spleen of Birds 230 



163. Pecidiar Secretions of Birds 230 



