5. Asphaltum--which is a black, solid substance, used in making
varnishes, covering roofs, and covering over vaults.
6. Paraffine--a white, crystalline substance, resembling white wax,
which can be made into beautiful wax candles; it melts at a
temperature of one hundred and ten degrees, and affords an excellent
light. All these substances are now made from soft coal.
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