| FIG. | | PAGE |
|---|
| 1. | —[Da Vinci’s designs for human flying-gear] | 9 |
| 2. | —[A possible air-scout] | 12 |
| 3. | —[Blanchard’s flying-machine] | 17 |
| 4. | —[Lana’s proposed vacuum balloon] | 24 |
| 5. | —[Montgolfier’s experimental balloon] | 34 |
| 6. | —[Charles’ first hydrogen balloon] | 36 |
| 7. | —[Montgolfier’s passenger balloon] | 39 |
| 8. | —[Charles’ passenger balloon] | 43 |
| 9. | —[La Flesselle] | 50 |
| 10. | —[The Great Balloon of Nassau] | 55 |
| 11. | —[Car of Nadar’s balloon] | 61 |
| 12. | —[Diagram of a modern spherical balloon with ripping panel] | 75 |
| 13. | —[Blanchard’s dirigible balloon, 1784] | 80 |
| 14. | —[Robert Brothers’ dirigible, 1784] | 82 |
| 15. | —[General Meusnier’s proposed dirigible, 1784] | 85 |
| 16. | —[Rufus Porter’s dirigible, 1820] | 87 |
| 17. | —[Jullien’s model dirigible, 1850] | 88 |
| 18. | —[Giffard’s steam dirigible, 1852] | 89 |
| 19. | —[Dupuy de Lome’s dirigible, 1872] | 92 |
| 20. | —[Renard’s dirigible, La France, 1884] | 94 |
| 21. | —[La Ville de Paris] | 121 |
| 22. | —[Le Petit Journal, Zodiac type] | 128 |
| 23. | —[Clément-Bayard II, 1910] | 133 |
| 24. | —[Morning Post dirigible, 1910] | 135 |
| 25. | —[Route of British military dirigibles from France to England, 1900] | 137 |
| 26. | —[Da Vinci’s helicopter] | 175 |
| 27. | —[Da Vinci’s parachute] | 176 |
| 28. | —[Veranzio’s parachute] | 178 |
| 29. | —[Lenormand’s parachute, 1784] | 179 |
| 30. | —[Paper traveling parachute] | 181 |
| 31. | —[Wenham’s aëroplane, 1866] | 185 |
| 32. | —[Penaud’s aëroplane toy, 1871] | 187 |
| 33. | —[Tatin’s aëroplane model, 1879] | 188 |
| 34. | —[Hargrave’s model screw monoplane, 1891] | 190 |
| 35. | —[Hargrave’s kite] | 191 |
| 36. | —[Launoy and Bienvenu’s helicopter, 1784] | 198 |
| 37. | —[Forlanini’s helicopter, 1878] | 200 |
| 38. | —[Le Bris’ aëroplane, 1855] | 204 |
| 39. | —[Mouillard’s aëroplane] | 208 |
| 40. | —[Blériot’s Toury-Artenay aëroplane circuit, 1908] | 269 |
| 41. | —[Map of the “Circuit de l’Est”] | 330 |
| 42. | —[Diagram of Curtiss hydro-aëroplane] | 333 |
| 43. | —[The Etrich monoplane of 1910] | 336 |
| 44. | —[Summer and winter average vertical temperature gradients] | 369 |
| 45. | —[General circulation of the atmosphere] | 378 |
| 46. | —[Normal Wind direction and velocity for January and February (Köppen)] | 381 |
| 47. | —[Normal Wind direction and velocity for July and August (Köppen)] | 383 |
| 48. | —[Trade and counter-trade winds] | 384 |
| 49. | —[Velocity diagram in horizontal section of a cyclone] | 398 |
| 50. | —[Funnel-like cloud sometimes observed in a tornado] | 409 |
| 51. | —[Vertical section of the St. Louis, Mo., tornado of May 27, 1896] | 411 |
| 52. | —[Horizontal section of St. Louis tornado of May 27, 1896] | 412 |
| 53. | —[Vertical section of short tornado] | 414 |
| 54. | —[Vertical section of a tall tornado] | 415 |
| 55. | —[Vertical section of a hail tornado] | 417 |
| 56. | —[Universal anemograph] | 428 |
| 57. | —[Records of wind variation in horizontal and vertical direction] | 429 |
| 58. | —[Records of Wind speed obtained by Langley] | 433 |