DRAWINGS IN THE TEXT 



XI 



PIG. 



28. Diagram of Reflkx Action 



29. Nervous System of a Pigeon 



30. Part op Breathing System of a Bird 



31. Syrinx of Raven .... 



32. Section of Syrinx of Male Blackbird 



33. System of Air-sacs .... 



34. Wind-pipe and Lungs .... 



35. Wing op Adelie Penguin . 



36. Courtship of Great Crested Grebe 



37. Song-box or Syrinx of a Diving Duck 



38. Diagrammatic Section of Egg . 



39. Male Reproductive Organs of Cock 



40. Three Forms of Spermatozoa . 



41. Female Reproductive Organs of Hen 



42. Cross-section through Oviduct 



43. Embryonic Disc 



44. Developing Embryo of Bird 



45. Vertical Section of Bird Embryo . 



46. The Sea-swift and its Edible Nest . 



47. Section through a Bird's Eye . 



48. Diagram of a Bird's Ear . 



49. Diagram Illustrating Animal Behaviour 



50. Restoration of Arch^opteryx . 



51. Skeleton of a Pterodactyl 



52. Nopcsa's Idea of an Ancestor of Birds 



53. Skeleton of Extinct Hesperornis . 



54. Kiwi ... ... 



55. Ostrich Feather .... 



56. Pectoral Girdle and Breastbone of Ost 



57. Types of Pigeons .... 



58. Inheritance in Andalusian Fowls . 



59. Combs of Fowls 



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