A quick circuit of the ship convinced Neils Halvorsen that the remainder of the dastard crew were evidently ashore, so he descended to the cabin in search of further evidence of crime. He was quite prepared to find Captain Scraggs's master's certificate in its familiar oaken frame, hanging on the cabin wall, but he was dumfounded to observe, hanging on the wall in a similar and equally familiar frame, the certificate of Adelbert P. Gibney as first mate of steam or sail, any ocean and any tonnage. But still a third framed certificate hung on the wall, and Neils again scratched his head when he read the wording that set forth the legal qualifications of Bartholomew McGuffey to hold down a job as chief engineer of coastwise vessels up to 1,200 tons net register. It was patent, even to the dull-witted Swede, that there had been foul play somewhere, and the schooner's log, lying open on the table, seemed to offer the first means at hand for a solution of the mystery. Eagerly Neils turned to the last entry. It was not in Captain Scraggs's handwriting, and contained nothing more interesting than the stereotyped reports of daily observations, currents, weather conditions, etc., including a notation of arrival that day at Honolulu. Slowly Halvorsen turned the leaves backward, until at last he was rewarded by a glimpse of a different handwriting. It was the last entry under that particular handwriting, and read as follows: June 21, 19--. Took an observation at noon, and find that we are in 20-48 S., 178-4 W. At this rate should lift Tuvana-tholo early this afternoon. All hands well and looking forward to the fun at Tuvana. Bent a new flying jib this morning and had the king and Tabu-Tabu holystone the deck. A.P. GIBNEY. Neils Halvorsen sat down to think, and after several minutes of this unusual exercise it appeared to the Swede that he had stumbled upon a clue to the situation. The last entry in the log kept by Mr. Gibney was under date of June 21st--just eleven days ago, and on that date Mr. Gibney had been looking forward to some fun at Tuvana-tholo. Now where was that island and what kind of a place was it? Neils searched through the cabin until he came across the book that is the bible of every South Sea trading vessel--the British Admiralty Reports. Down the index went the old deckhand's calloused finger and paused at "Friendly islands--page 177"; whereupon Neils opened the book at page 177 and after a five-minute search discovered that Tuvana-tholo was a barren, uninhabited island in latitude 21-2 south, longitude 178-49 west.