LIST OF ILLUSTRATIONS. 



FIG. PAGE 



1. How to find the North point - 8 



2. Magnetic Declination lo 



3. Hill-shading by means of hachures 12 



4. Contour-lines round a hill 14 



5. Section across the Thames basin, showing the form of the 



ground 16 



6. Formation of a spring . 23 



7. Section of Hampstead Heath 26 



8. Horizontal permeable and impermeable strata 29 



9. Inclined permeable and impermeable strata 29 



10. Effect of fault on position of spring or well ...... 30 



11. Diagrammatic section across the London basin 31 



12. Rain-gauge 49 



13. Daniell's hygrometer 52 



14. Ice in water 57 



15. Rock crystal 58 



16. Snow-crystals 61 



17. Ice-flowers 63 



18. Hair hygrometer ^o 



19. Dry and wet bulb thermometers , 7i 



20. Decomposition of red o.xide of mercury 77 



21. Torricelli's experiment 90 



22. Times weather chart 93 



23. Daily News barometer chart 96 



