114 QUESTIONS ON THE 



73. Which is the only simple combustible that nature 

 offers pure and in abundance ? 



74. What substance is that which so much abounds 

 in the different kingdoms of nature } 



75. What quantity of sulphur has been imported annu- 

 ally, for the purpose of making gunpowder and sulphuric 

 acid? 



7t>. With what metals is sulphur found in combina- 

 tion ? 



77- Why are milk and bread so necessary for the first 

 food of an infant : 



78. With what metals is phosphorus found in combi- 

 nation ? 



79. In what part of the animal kingdom does phos- 

 phorus chiefly abound ? 



80. What is the chief use of the sub-borate of soda ? 



81. What is the nature of Iodine, when was it first 

 discovered, and how is it procured ? 



82. Is wood a simple or compound combustible ? 



83. Which are the supporters of combustion ? 



84. Are supporters of combustion always supporters 

 of life ? 



85. On what does the rapidity of combustion depend ? 



86. What is the philosophical effect produced on a fire 

 by blowing ? 



87. Do the products of any combustion increase or 

 decrease in weight ? 



88. What would be the weight of a fother of lead when 

 converted into red lead ? 



89. Whence does the light come during combustion ? 



90. Is the product of combustion always an oxide ? 



91. If potassium or sodium be burnt, what will be its 

 product 1 



92. What metal is that which has such affinity for 

 oxygen, as to decompose water so rapidly as to ignite the 

 hydrogen 1 



93. How is Potassium formed, and what are its pecu- 

 liar qualities ? 



94. Has Sodium any peculiar affinity for oxygen ? 



95. How is soda obtained, and what are its uses ? 



96. Give the theory of burning a common candle. 



