| Instrument Shelter (Figure 4) | Frontispiece | |
| FIGURE | PAGE | |
|---|---|---|
| 1. | Winter and Summer Vertical Temperature Gradients, in degrees Centigrade and Fahrenheit | 12 |
| 2. | Showing light from lamp a passing into dust-free air at b, and passing out at c without illuminating the interior | 46 |
| 3. | Standard Weather Bureau Kite | 64 |
| 5. | Comparison of the Thermometer Scales | 67 |
| 6. | Dry and Wet Bulb Thermometers | 68 |
| 7. | Mercurial Barometer | 78 |
| 8. | Continuous records of the temperature from 4 P.M. to 9 A.M. | 87 |
| 9. | Continuous records of the temperature 5 feet and 35 feet above ground on a tower in a pear orchard | 95 |
| 10. | Average dates of last killing frost in Spring | 96 |
| 11. | Average dates of first killing frost in Fall | 97 |
| 12. | Trade wind circulation | 99 |
| 13. | Average surface winds and pressure of the globe | 102 |
| 14. | How winds would blow into a cyclone on a non-rotating earth | 108 |
| 15. | Deflection of wind due to earth’s rotation | 109 |
| 16. | Annual, summer, and winter wind velocities with altitude | 110 |
| 17. | Tornado Cloud | 145 |
| 18. | The St. Louis Tornado of May 27, 1896, Shot a Pine Scantling through the Iron Side of the Eads Bridge | 147 |
| 19. | The St. Louis Tornado of May 27, 1896, Shot a Shovel Six Inches into the Body of a Tree | 147 |
| 20. | The St. Louis Tornado Drove Straws One half Inch into Wood | 149 |
| 21. | Equinoxes, March 21 and September 22 | 163 |
| 22. | Summer Solstice, June 21 | 164 |
| 23. | Winter Solstice, December 21 | 164 |
| 24. | Winter and Summer Solstices, and the Equinoxes | 165 |
| 25. | As angle of incidence decreases from 90° to 10° the heat received on upper end of blocks is spread over greater area at bottom, and its temperature diminished | 165 |
| 26. | Altitude attained by Sun at midday and length of its track above the horizon at the Summer and Winter Solstices and at the two Equinoxes | 167 |
| 27. | Summer day and Summer night temperatures in the same narrow valley | 204 |
| 28. | Average Monthly Temperature and Rainfall of Typical Places in North America | 207 |
| 29. | Average Monthly Temperature and Rainfall of Typical Places in the Old World | 208 |
| 30. | Changes in Climate in California during the Christian Era | 237 |
| 31. | Snow Crystals | 286 |