LIGHT 



EXPERIMENT PAGE 



41. RELATIVE VALUE OF DIFFERENT LIGHTS . . . . 52 



42. REFLECTION How LIGHT is REFLECTED . . .53 



43. THE PATH OF LIGHT THROUGH PLATE GLASS ... 55 



44. THE PATH OF LIGHT THROUGH A GLASS PRISM . . 56 



45. APPARENT DEPTH OF A POND 56 



46. PHOTOGRAPHIC PAPER 58 



47. LENSES 58 



48. THE MAGNIFYING POWER OF A SIMPLE LENS ... 60 



49. A TEST FOR SIGHT 61 



50. LIGHT AND ITS EFFECT ON MICROORGANISMS 61 



51. THE CHEMICAL ACTION OF LIGHT 62 



52. ILLUMINATION AND COLOR 62 



53. How STRANGE COLORS ARE PRODUCED .... 63 



54. HEATING POWER OF DIFFERENT COLORS .... 64 



MACHINES 



55. THE LEVER 65 



56. THE INCLINED PLANE 66 



57. PULLEYS 67 



58. THE POWER OF STEAM . . 68 



CHEMISTRY 



59. 60. THE CHARACTERISTICS OF ACIDS AND OF BASES . 69 



61. NEUTRALIZATION 70 



62. To MAKE SOAP 71 



63. HARD WATER SOAP 71 



64, 65. BAKING SODA 72 



66. BLEACHING POWDERS 73 



67. THE REMOVAL OF STAINS 74 



