212 



INDEX. 



Tyndall, on souls of fire ... 61 



" on Dr. Thos. Young 

 and the undulatory 

 theory of light 66, 63 

 " on iron and lead bul- 

 lets ... 60 

 " on the heat caused by 

 the earth falling in- 

 to the sun ... 61 

 " on waves of coloured 



light ... 79 



on electricity ... 86 



on magnetic curves 92, 93 

 on sound ... 102 



his experiments at 



South Foreland ... 105 

 new theory of sound ... 105 

 on glaciers ... 109 



on the internal fire of 

 earth ... 154 



TL 



Undulatory theory of light dis- 

 covered by Dr. Young ... 66 

 " follows Emission into 



oblivion ... 68 



" Tyndall on the stabil- 

 ity of the ... 68 

 Uxmal, Central America ... 115 



V. 



Vacuum, how caused in the at- 

 mosphere ... 128 

 " causes wind ... 128 

 Vegetable life ... 11 

 Volcanoes, Dr. Mayer on the 



cause of ... 154 



" Sir John Herschell on 155 

 " Prof. Mallet on ... 158 

 " atomagnetic theory of 157 

 " when apt to become 



dangerous ... 159 



Volcanoes, Mount St. Helena, 

 California, ex- 

 tinct 51, 158 



w. 



Water, more powerful than fire 107 

 in granite ... 10 



of what composed ... 108 

 manufactured in the at- 

 mosphere ... 109 

 Tyndall's Forms of ... 109 

 no air in ... 115 

 Tyndall proves air to be 



in ... 115 



" efficacy of hot, in dis- 

 ease ... 191 

 " danger of iced ... 192 

 Waves of coloured light, Prof. 



Tyndall on ... 79 



Weather and weather prophets, 

 Sir John Herschell on 

 Weather maps, American ... 132 

 Wells, Dr., theory of dew ... 121 

 " experiments with 



wool packs ... 121 

 " says radiation is the 



cause of dew ... 121 

 " on the cause of 



moonblindness ... 121 

 Wheat, becoming rye ... 23 



Winds, Prof. Rogers on the 



cause of ... 128 



" the sun the cause of... 128 



World, the end of the ... 46 



Wrecker's light, faith in man 



like to the ... 130 



T. 



Young, Dr. Thos., author of the 

 Undulatory theory cf 

 light ... 66 



" Tyndall'a estimate of ... 66. 



