For some unexplainable reason Captain Hornaby tried to cross Harry's bow.
— from Further Adventures of Quincy Adams Sawyer and Mason Corner Folks by Charles Felton Pidgin

" "No chance of starving us," replied Captain Hamilton.
— from Doubloons—and the Girl by John Maxwell Forbes

Then was Rustem angry, and in his impatience he spake sharply unto Rakush, chiding him for thus disturbing his slumbers by causeless alarms.
— from The Story of Rustem, and other Persian hero tales from Firdusi by Elizabeth D. Renninger

"Is there any special place where a girl, who might wish to escape observation for some unknown reason, could hide around here, Mrs. Meckelburn?"
— from The Outdoor Girls in a Motor Car; Or, The Haunted Mansion of Shadow Valley by Laura Lee Hope

That, in common with the monk, he held the secret of the dead man’s past seemed practically certain, and perhaps Mabel feared some unwelcome revelation concerning her father’s actions and the source of his wealth.
— from As We Forgive Them by William Le Queux

Now, if your trusty cox'sn, who is an excellent sailor, no doubt, though deemed for some unknown reason common, has any royal blood in his veins, we can with the stroke of a pen make either an Admiral of him, or a Field-Marshal, or even a Bishop.
— from The Life of a Celebrated Buccaneer A Page of Past History for the Use of the Children of To-day by Richard Clynton

Evidently the writer had been interrupted in his task of addressing the letter, and had laid it aside, intending to add other words [164] later; or else, having got that far toward identifying the intended recipient of the missive, he had, for some unknown reason, changed his mind.
— from The Guardsman by Homer Greene

A few days after the departure of the steamer Ulysses radically changed his method of living.
— from Mare Nostrum (Our Sea): A Novel by Vicente Blasco Ibáñez