LIST OF ILLUSTRATIONS FIG. PAGE 1. Silver sheet floating on water . . . . . 4 2. Column and index of minimum thermometer . . . 6 3. Thread of golden syrup rising and forming a drop . . 8 4. Drops of different sizes resting on flat plate . . 10 5. Formation of a sphere of orthotoluidine . . . 12 6. Detached sphere floating under water . . . . 13 7. The centrifugoscope . . . . . . . 14 8. Aniline drops falling through cold water and ascending through hot water . . . . . . 17 9. Aniline skins enveloping water . . . . . 20 10, 11, 12. The “diving” drop. Three stages . . . . 23 13. Apparatus for forming ascending or descending drops of liquids 27 14-20. Formation of a drop of orthotoluidine, showing the droplet. Seven stages . . . . . 29-31 21, 22. Automatically formed aniline drops, showing the formation of droplets from the neck . . . 34, 35 23-25. Jets of orthotoluidine discharged under water . . 39 26. Water stretched between a tube and a plate . . . 40 27-30. A liquid column stretched upwards by addition of water until broken. Four stages . . . 43 31. A column of aceto-acetic ether in water . . . 44 32. Apparatus for communicating drops . . . . 45 33. Combined vapour and liquid drops . . . . 49 34. Spheroid of water on a hot plate . . . . 58 35. Forces acting on a floating globule . . . . 61 36. Aniline globules on a water surface . . . . 64 37. Orthotoluidine globules on a water surface . . . 66 38. Resolution of a floating skin into globules . . . 68 39. Network formed from a film of tar-oil . . . . 70 40. Quinoline rings and perforated plates . . . . 71 41. The expanding globule . . . . . . 72 42. The “devouring” globule. Five stages . . . 74 43. Photograph of one globule absorbing another . . . 75 PREFACE