exudes naturally from a number of trees, including tbe Rhus copallina of North America, the Elaocarpus copaliftr of the East Indies, and the Hymetuza verrucosa, of Madagascar. The Zanzibar gum is of both fossil and recent character. The lumps of this hard resin, which is used in making highquality copal coach varuish, are yellowish in colour, hard, have a lustrous appearance, and easily fracture. The several varieties differ to some extent in their solubilities in various liquids such as alcohol and turpentine oil, and by exposure to the air they absorb oxygen and become more soluble. The solubility is also increased by melting the copal at the lowest possible temperature.
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