88. Q. In what country is the manufacture of friction matches carried on to a very large extent? A. In Sweden; and that country, it is now stated, produces about seventy-five per cent. of all the matches made in the world.
89. Q. What is probably the most familiar and representative form of carbon? A. That known as charcoal.
90. Q. How is lamp-black produced? A. It is a product of the imperfect combustion of substances like oil, tar, resin, and the like, which are very rich in carbon.
91. Q. What are two well known compounds of carbon? A. Anthracite coal and bituminous coal.
92. Q. Of what origin do both of these combustibles, when carefully studied, show distinct evidences? A. Of their vegetable origin.
93. Q. What is the diamond? A. It is nearly pure carbon, crystallized.
94. Q. What are some of the other natural forms in which carbon is found in large quantities? A. In petroleum, marble, and limestone.
95. Q. When combined with oxygen alone, what two compounds only does carbon form? A. Carbon mon-oxide and carbon di-oxide.
96. Q. What is the material on which the manufacture of illuminating gas is based? A. Bituminous coal.
97. Q. In the distillation of coal for the manufacture of gas, what three distinct classes of substances are produced? A. Solids, which are left in the retorts; liquids, which are condensed in the various coolers; and gases, which pass on to the gas holder.