This transcription follows the text of the edition published by Payson & Clarke Ltd in 1929. The following changes have been made to correct what are believed to be unambiguous printer’s errors. * “Inpector” was changed to “Inspector” (Chapter VI). * “ect.” was changed to “etc.” (Chapter VI). * “Phys,” was changed to “Phys.” (Chapter VI). * “Brittanica” was changed to “Britannica” (Chapter VII). * “occcasionally” was changed to “occasionally” (Chapter IX). * “impossible for use” was changed to “impossible for us” (Chapter XI). * “Duhamel Freres” was changed to “Duhamel Frères” (Chapter XV). * “testting” was changed to “testing” (Chapter XVII). * “a complicate” was changed to “a complicated” (Chapter XIX). * “realiable” was changed to “reliable” (Chapter XXI). * “fiften” was changed to “fifteen” (Chapter XXV). * “faint preliminary whim” was changed to “faint preliminary whirr” (Chapter XXV). * “startingly” was changed to “startlingly” (Chapter XXV). * “necesity” was changed to “necessity” (Chapter XXVI). * Seven occurrences of mismatched quotation marks have been repaired.