"We had already," Hammond stated. "The judges were suspicious of that airplane following the horses at night and had the trail watched last night. They found that Mortley had hired that aviator to take the Continental package from his rider between Las Vegas and Chappelle last night and carry it ahead to his next rider, who rode back to get it. That forfeited the race, and ends Mortley's connection with the Continental, because Bristol discharged him as soon as he heard of it. You'd have won the race if you had walked Sagamore all the way from Las Vegas." And Dillon, as he stroked Sagamore's glistening mane, understood the mysterious gain that his great horse had striven so hard to overcome during the night. SOME EASY TESTS FOR DIAMONDS Here are half a dozen easy tests for diamonds. Real diamonds will stand up under all of them, but no imitation can come through any of them. First, try a file; if it makes a scratch the stone is an imitation. Second, cover the stone with borax, heat it and drop it into cold water; an imitation will burst, but a real diamond will not be harmed. Third, drop a little hydrofluoric acid on it; this will dissolve it if it is not genuine. Fourth, drop it into a tumbler of water; if real it will still shine brilliantly. Fifth, put a drop of water on it; if the water spreads it is not a real diamond, but if the drop retains its globular shape the gem is real. Sixth, make a pencil dot on a piece of white paper, with a lens focus the light upon the dot, hold the stone near the paper; if the dot can be seen clearly through the stone it is a diamond, but if the dot appears foggy or duplicated the stone is false. [Illustration] DESERT DRIFT BY JOHN BRIGGS _Author of "The Last of the Kings," etc._ EAST AND WEST MEET ON THE TREACHEROUS SANDS OF THE PAINTED DESERT; AND ONLY THE SANDS WHICH SAW THE MEETING CAN TELL OF THE FATE OF THE BLACK OPAL, WHICH WAS THE HERITAGE OF AN ANCIENT DYNASTY "One First Class Passage--Prince Yuen Ming Chu." Thus his American Pacific Liner passport had read, thirty years ago. The Chinaman halted his time-and-wind-worn outfit in the sickly shadow of a smoke tree. He was clad in blue jumper and overalls. His gray felt hat was peaked after the common fashion of the desert country. With hands long accustomed to the task, he slipped his diamond hitch, removed his bed roll, kiaks and canvas water bags, and after a few final jerks with the cinches, he had uncovered a dust-hued beast so diminutive that the revelation might have startled a casual observer. After staking the little animal where it could enjoy some very dry galleta grass, Prince Yuen Ming Chu accomplished a feat never duplicated before his time, nor since, on the drifting surface of the Painted Desert. He picked up a long roll of heavy pongee, from one end of which projected a large bamboo stick.