SEPTEMBER 18, 1880.] 183 THE INDIA-RUBBER AND GUITA PERCHA … of caoutchouc should remain adherent to the on the unsuspecting merchant as caoutchouc, are made into balls, and sold mould on the evaporation of as ‘‘negro head.” The negro- the solvent. head rubber is frequently made From this time until the end into crude representations of of the eighteenth…
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