x CONTENTS. 
CHAPTER XXI.—WALKING OF BIRDS. 
a 
Motions of Insects : u , 4 * i - nr 
Footless Birds . i : : ‘ : ‘ 3 257 
Feet of the Swift . a : A P ‘ ‘ a, He 
Feet of Swallows 258 
Walk of the Dipper, the Coot, the Land. rail, and other Birds 259 
Running of the Ostrich : ; " “ . 260 
Tame Ostriches at Podor . 3 . : 3 . 262 
Fleetness of the Bustard . B - ‘ p 263 
The Flamingo and the Stilt i A 264 
Climbing Birds. “ 5 266 
White’s Remarks on the Walk of Birds - i ib. 
Walk of the Chinese Jacana. ¥ 3 ib. 
CHAPTER XXII.—F.LicutT oF BIRDs. 
Flying similar to Swimming “ap wn orien ok, ier ee.) 
Swimming-bladder of Fishes , z 3 “| eee 
Air-cells of Birds discovered by Harvey : : : . 270 
Air-bones . " “i . . 3 7218 
Remarks of Sir Charles Bell ; : : : : . 273 
Wings and Tailas Organsof Flight . . . . . 276 
CHAPTER XXIII.—MIGRATION OF BIRDs. 
Conjectures respecting the Appearance and Disappearance 
of Birds : . 279 
Account of Swallows found on the Banks of the Rhine . 280 
White’s Investigation as to the Appearance and At deta 
ance of Swallows. : ; . 28) 
Opinion of Mr. Bree on the same “Subject 9 Re ee, 
Swallows kept in Winter . . 282 
Submersion of Swallows believed in by Linneus, Etmuller, 
Cuvier, and others ‘ : . ~.@85 
Anatomical Argument against Submersion ! . 286 
Migration to the Moon : . 287 
Facts proving the Migration of Birds to other Countries | 288 
Catesby’s Observations on the Migration of Birds. . 
Migration of the Ricebird . ‘ ; . 296 
Migration of the American Passenger Pigeon i 3 . 291 
Migration of the Peterel and Bluebird a gt eins Sada | 
Migration of the Gannet . a 5 SO OA . 294 
Migration of the Stork ‘ ya oF ‘ 72 07, . 295 
Migration of the Quail : as Brice f . 296 
Opinions as to the Causes of Migration - : : - ib 
