The Inca Emerald. Scoville Samuel

the vast river had swept enough earth from the southern continent into the ocean to change the color of the water for a hundred miles out at sea. Just at sunrise the next day the steamer glided up the Amazon on its way to the old city of Belem, seventy miles inland.

      "The air smells like a hot, mouldy cellar!" grumbled Jud; and soon the Cornwall pilgrims began to glimpse things strange and new to all three of them. Groups of slim assai-palms showed their feathery foliage; slender lianas hung like green snakes from the trees; and everywhere were pineapple plants, bread-fruit trees, mangos, blossoming oranges and lemons, rows of enormous silk-cotton trees, and superb banana plants, with glossy, velvety green leaves twelve feet in length curving over the roof of nearly every house. Beyond the city the boys had a sight of the jungle, which almost without a break covers the greater part of the Amazon basin, the largest river-basin on earth. They landed just before sunset, and, under Professor Ditson's direction, a retinue of porters carried their luggage to the professor's house, far down the beach, the starting-point for many of his South American expeditions.

      As the sun set, the sudden dark of the tropics dropped down upon them, with none of the twilight of higher latitudes. Jud grumbled at the novelty.

      "This ain't no way to do," he complained to Professor Ditson. "The sun no more than goes down, when bang! it's as black as your hat."

      "We'll have that seen to at once," responded the professor, sarcastically. "In the meantime, be as patient as you can."

      With the coming of the dark, a deafening din began. Frogs and toads croaked, drummed, brayed, and roared. Locusts whirred, and a vast variety of crickets and grasshoppers added their shrill note to the uproar, so strange to visitors and so unnoticed by natives in the tropics.

      "Hey, Professor!" shouted Jud, above the tumult, "what in time is all this noise, anyway?"

      "What noise?" inquired Professor Ditson, abstractedly.

      The old trapper waved both hands in a circle around his head and turned to the boys for sympathy. "Sounds like the Cornwall Drum and Fife Corps at its worst!" he shrieked.

      "What do you mean, Jud?" said Will, winking at Joe.

      "Poor Jud!" chimed in the latter, shaking his head sadly, "this trip too much for him. He hearing noises inside his head."

      For a moment, Jud looked so horrified that, in spite of their efforts to keep up the joke, the boys broke down and laughed uproariously.

      "You'll get so used to this," said Professor Ditson, at last understanding what they were talking about, "that after a few nights you won't notice it at all."

      At the professor's bungalow they met two other members of the expedition. One of these was Hen Pine, a negro over six feet tall, but with shoulders of such width that he seemed much shorter. He had an enormous head that seemed to be set directly between his shoulders, so short and thick was his neck. Hen had been with Professor Ditson for many years, and, in spite of his size and strength, was of a happy, good-natured disposition, constantly showing his white teeth in irresistible smiles. Pinto, Professor Ditson's other retainer, was short and dark, an Indian of the Mundurucu tribe, that warlike people which early made an alliance of peace with the Portuguese pioneers of Brazil which they had always scrupulously kept. Pinto had an oval aquiline face, and his bare breast and arms had the cross-marks of dark-blue tattooing which showed him to have won high rank as a warrior on the lonely River of the Tapirs, where his tribe held their own against the fierce Mayas, those outlawed cannibals who are the terror of the South American forest.

      That evening, after dinner, Professor Ditson took Jud and the boys out for a walk along the beach which stretched away in front of them in a long white curve under the light of the full moon. The night was full of strange sounds, and in the sky overhead burned new stars and unknown constellations, undimmed even by the moonlight, which showed like snow against the shadows of the jungle. Professor Ditson pointed out to the boys Agena and Bungula, a noble pair of first-magnitude stars never seen in the North, which flamed in the violet-black sky. As they looked, Will remembered the night up near Wizard Pond before the bear came, when Joe had told him Indian stories of the stars. To-night, almost overhead, shone the most famous of all tropical constellations, the Southern Cross.

      Professor Ditson told them that it had been visible on the horizon of Jerusalem about the date of the Crucifixion. From that day, the precession of the equinoxes had carried it slowly southward, and it became unknown to Europeans until Amerigo Vespucci on his first voyage saw and exultantly wrote that he had seen the "Four Stars," of which the tradition had lingered. The professor told them that it was the sky-clock of the tropics and that sailors, shepherds, and other night-wanderers could tell the time within fifteen minutes of watch-time by the position of the two upper stars of this constellation.

      "It looks more like a kite than a cross," interjected Jud. "What's that dark patch in the Milky Way?" he inquired, pointing to a strange black, blank space showing in the milky glimmer of the galaxy.

      "That must be the Coal-sack," broke in Will, before Professor Ditson could reply.

      "I remember reading about it at school," he went on.

      "When Magellan sailed around Cape Horn, his sailors saw it and were afraid that they would sail so far south that the sky wouldn't have any stars. What cheered them up," went on Will, "was the sight of old Orion, which stays in the sky in both hemispheres," and he pointed out the starry belt to Jud and Joe, with the sky-king Sirius shining above it instead of below as in the northern hemisphere.

      As Jud and the boys stared up at the familiar line of the three stars, with rose-red Betelgeuse on one side and fire-white Rigel on the other, they too felt something of the same comfort that the old-time navigators had known at the sight of this constellation, steadfast even when the Great Bear and the Pole Star itself had faded from the sky. As they continued to gaze upward they caught sight of another star, which shone with a wild, blue gleam which rivaled the green glare of the dog-star, Sirius. Professor Ditson told them that it was Canopus, Mohammed's star, which he thought led him to victory, even as Napoleon believed that the planet Venus, seen by daylight, was his guiding star. Then the professor traced for them that glittering river of stars, Eridanus, and showed them, guarding the southern horizon, gleaming Achernar, the End of the River, a star as bright as is Arcturus or Vega in the northern sky. Then he showed them Fomalhaut, of the Southern Fish, which in the North they had seen in the fall just skipping the horizon, one of the faintest of the first-magnitude stars. Down in the southern hemisphere it had come into its own and gleamed as brightly near this northern horizon as did Achernar by the southern. It was Will who discovered the Magellanic Clouds, like fragments of the Milky Way which had broken up and floated down toward the South Pole. These had been also seen and reported by Magellan on that first voyage ever taken around the world four hundred years ago.

      Farther up the beach, Jud and the boys came to a full stop. Before them towered so high that the stars seemed tangled in its leaves a royal palm, one of the most magnificent trees on earth. Its straight, tapered shaft shot up over a hundred and twenty-five feet and was crowned with a mass of glossy leaves, like deep-green plumes. As it touched the violet sky with the full moon rising back of its proud head, it had an air of unearthly majesty.

      Beneath their feet the beach was covered with "angel-wings," pure white shells eight inches long, shaped like the wings of angels in old pictures. With them were beautifully tinted tellinas, crimson olivias with their wonderful zigzag, tentlike color patterns, large dosinias round as dollars, and many other varieties, gold, crimson, and purple.

      Some distance down the beach the professor kept a large canoe, in which the whole party paddled out into the bay. As they flashed over the smooth surface, the clamor of the night-life dwindled. Suddenly, from the bushes on a little point, sounded a bird-song which held them all spellbound, a stream of joyous melody, full of rapid, ringing notes, yet with a purity of tone which made the song indescribably beautiful. It seemed to include the ethereal quality of the hermit-thrush, the lilt and richness of the thrasher, and the magic of the veery's song, and yet to be more beautiful than any or all of them together. On and on the magic melody flowed and rippled, throbbed and ebbed in the moonlight. Suddenly it stopped. Then from the same thicket burst out a medley of different songs. Some of them were slow and mellow. Others had silvery, bell-like trills. There were flutelike calls,