

Till CONTENTS. 



LETTER XIII. 



Spontaneous combustion In the absorption of air by 

 powdered charcoal and of hydrogen by spongy platinum 

 Dobereiner's lamp Spontaneous combustion in the 

 bowels of the earth Burning cliffs Burning soil Com- 

 bustion without flame Spontaneous combustion of human 

 beings Countess Zangari Grace Pett Natural fire- 

 temples of the Guebres Spontaneous fires in the Caspian 

 Sea Springs of inflammable gas near Glasgow Natural 

 light-house of Maracaybo New elastic fluids in the 

 cavities of gems Chemical operations going on in their 

 cavities Explosions produced in them by heat Re- 

 markable changes of colour from chemical causes 

 Effects of the nitrous oxide or Paradise gas when 

 breathed Remarkable cases described Conclusion 



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