[16] 134:28 Zaffre. An oxide of cobalt. See dictionary.
[17] 134:28 aqua regia. Royal water--a mixture of nitric and
hydrochloric acids.
[18] 134:30 regulus. An old chemical term.
[19] 135: 28 Captain Kidd. A Scottish sea captain who lived in New
York in the seventeenth century.
[20] 138:19 Golconda. A town in India noted for its diamond market.
[21] 138:28 cryptographs. Secret forms of writing.
[22] 139:27 Spanish main. The northeastern portion of South America,
the Caribbean Sea, and the coast of North America to the Carolinas
were harassed by the Spaniards.
[23] 144:6 rationale. Reasonable basis.
[24] 149:19 insignium. Sign.
COLLATERAL READINGS
_The Murders in the Rue Morgue_, Edgar Allan Poe.
_The Mystery of Marie Roget_, Edgar Allan Poe.
_The Purloined Letter_, Edgar Allan Poe.
_The Sign of the Four_, A. Conan Doyle.
_A Scandal in Bohemia_, A. Conan Doyle.
_The Chronicles of Addington_, B. Fletcher Robinson.
_The Mystery of the Steel Disk_, Broughton Brandenburg.
_The Rajah's Diamond_, R.L. Stevenson.
_The Doctor, his Wife, and the Clock_, Anna Katharine Green.
_The Adventures of Sherlock Holmes_, A. Conan Doyle.
_The Hound of the Baskervilles_, A. Conan Doyle.
_A Double-Barrelled Detective Story_, Mark Twain.
_Gallegher_, Richard Harding Davis.
THE BIRTHMARK[1]
_By Nathaniel Hawthorne (1804-1862)_.
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