PUZZLING QUESTIONS WHICH CANNOT BE ANSWERED AS YET.—A STEP TOWARD RECONCILIATION.—REUNION OF A BROKEN FRIENDSHIP.—PIECES ALL COLLECTED AND JOINED.—JOY OF JACK.—SOLEMN DEBATES OVER THE GREAT PUZZLE OF THE PERIOD.—FRIENDLY CONFERENCES AND CONFIDENCES.—AN IMPORTANT COMMUNICATION.A LETTER!—STRANGE HESITATION.—GLOOMY FOREBODINGS.—JACK DOWN DEEP IN THE DUMPS.—FRESH CONFESSIONS.—WHY HE MISSED THE TRYST.—REMORSE AND REVENGE.—JACK'S VOWS OF VENGEANCE.—A VERY SINGULAR AND UNACCOUNTABLE CHARACTER.—JACK'S GLOOMY MENACES.CHAPTER XXX.