Due to certain irreconcilable differences two Scottish men, one being Catholic and the other being atheist, decide to fight a duel to the death. However, duels are against the law, so they have to find a secret place for that occasion. Searching for such place they must avoid authorities, and also numerous kinds of people who all try to convince them to give up on a duel, leading to many comic adventures.

Readers will find fascinating details about the discovery, whereabouts, and value of famous opals, from such classic specimens as the Burning of Troy Opal to the Bonanza Opal and other more recent discoveries. Finally, the book surveys today's major opal-producing areas and provides current information on opal occurrence worldwide. Punctuating the text are useful tables, extensive glossaries of opal types and opal-related terms, and beautiful photographs that capture the essence and mystery of this most exquisite stone.

Reports for 1884-1886/87 issued in 2 pts., pt. 2 being the Report of the National Museum.