The Inca Emerald. Scoville Samuel

milk an' honey," remarked Jud, at last, after he had eaten and drunk all that he could hold.

      "This vegetable milk is particularly rich in gluten," observed Professor Ditson, learnedly.

      "I guess it'd gluten up a fellow's stomach all right if he drank too much of it," remarked Jud, smacking his lips over the sweet, sticky taste which the juice of the cow-tree left in his mouth.

      After lunch, most of the party retired to their hammocks in the cool dark of the house for the siesta which South American travelers find an indispensable part of a tropical day. Only the scientist and Will stayed awake to catch butterflies through the scented silence of the forest where the air, filled with the steam and perfume of a green blaze of growth, had the wet hotness of a conservatory. When even the insects and the untiring tree-toads were silenced by the sun, Professor Ditson, wearing a gray linen suit with a low collar and a black tie, was as enthusiastic as ever over the collecting of rare specimens, and was greatly pleased at Will's interest in his out-of-door hobbies.

      Together they stepped into the jungle, where scarlet passion-flowers shone like stars through the green. Almost immediately they began to see butterflies. The first one was a magnificent grass-green specimen, closely followed by others whose iridescent, mother-of-pearl wings gleamed in the sunlight like bits of rainbow. On a patch of damp sand a group made a cloud of sulphur-yellow, sapphire-blue, and gilded green-and-orange. The professor told Will that in other years he had found over seven hundred different kinds within an hour's walk from this forest bungalow, being more than double the number of varieties found in all Europe.

      Deep in the jungle, they at last came to a little open stretch where the Professor had often collected before and which to-day seemed full of butterflies. Never had Will imagined such a riot of color and beauty as there dazzled his eyes. Some of the butterflies were red and yellow, the colors of Spain. Others were green, purple, and blue, bordered and spangled with spots of silver and gold. Then there were the strange transparent "glass-wings." One of these, the Hetaira esmeralda, Will was convinced must be the most beautiful of all flying creatures. Its wings were like clear glass, with a spot of mingled violet and rose in the center of each one. At a distance, only this shimmering spot could be seen rising and falling through the air, like the wind-borne petals of some beautiful flower. Indeed, as the procession of color drifted by, it seemed to the boy as if all the loveliest flowers on earth had taken to themselves wings, or that the rainbow-bridge of the sky had been shattered into fragments which were drifting slowly down to earth.

      The largest of them all were the swallowtails, belonging to the same family as the tiger, and blue and black swallowtail, which Will had so often caught in Cornwall. One of that family gleamed in the sunlight like a blue meteor as it flapped its great wings, seven inches from tip to tip and of a dazzling blue, high above the tree-tops. Another member of the same family, and nearly as large, was satiny white in color. Professor Ditson told Will that both of these varieties were almost unknown in any collection, as they never came within twenty feet of the ground, so that the only specimens secured were those of disabled or imperfect butterflies which had dropped to the lower levels.

      "Why couldn't I climb to the top of one of those trees with a net and catch some?" inquired Will, looking wistfully up at the gleaming shapes flitting through the air so far above him.

      "Fire-ants and wasps," returned the professor, concisely. "They are found in virtually every tree. No one can stand the pain of an ant's bite, and one sting of a Maribundi wasp has been known to kill a strong man."

      That night, tired out by their long day of hunting, the whole party went to bed early. Will's sleeping-room was an upper screened alcove, just large enough to hold a single hammock. Somehow, even after his long hard day, he did not feel sleepy. Great trees shadowed his corner, so thick that even the stars could not shine through their leaves, and it seemed to Will as if he could stretch out his hands and lift up dripping masses of blackness, smothering, terrifying in its denseness. From a far-away tree-top the witch-owl muttered over and over again that mysterious word of evil, "Murucututu, murucututu," in a forgotten Indian tongue. He had laughed when Pinto told him a few nights before that the owl was trying to lay a spell on those who listened, but to-night in the dark he did not laugh.

      Then close at hand in a neighborhood tree-top sounded a beautiful contralto frog-note slowly repeated. "Gul, gul, gul, gul, guggle, gul, guggle," it throbbed. The slow, sweet call gave the boy a sense of companionship, and he fell asleep with the music of it still sounding in his ears.

      Toward midnight he woke with a vague sense of uneasiness. It was as if some hidden subconsciousness of danger had sounded an alarm note within his nerve centers and awakened him. Something seemed to be moving and whispering outside of the screened alcove. Then a body struck the screen of mosquito-netting, and he heard the rotten fiber rip. Another second, and his little room was filled with moving, flitting, invisible shapes. Great wings fanned the air just above his face. There was the faint reek of hot, furry bodies passing back and forth and all around him. For a moment Will lay thinking that he was in a nightmare, for he had that strange sense of horror which paralyzes one's muscles during a bad dream so that movement is impossible. At last, by a sudden effort, he stretched out his hand and struck a match from a box which stood on a stand beside his hammock. At the quick spurt of flame through the dark, from all parts of the little room came tiny, shrill screeches, and the air around him was black with whirling, darting shapes. Suddenly into the little circle of light from the match swept the horrible figure of a giant bat, whose leathern wings had a spread of nearly two and a half feet, and whose horrible face hovered and hung close to his own. Never had the boy believed that any created thing could be so grotesquely hideous. The face that peered into his own was flanked on each side by an enormous leathery ear. From the tip of the hairy muzzle grew a spearlike spike, and the grinning mouth was filled with rows of irregular, tiny, gleaming sharp teeth, gritting and clicking against each other. Deep-set little green eyes, which glistened and gleamed like glass, glared into Will's face. Before he could move, a great cloud of flying bats, large and small, settled down upon him. Some of them were small gray vampire-bats with white markings, others were the great fruit-eating bats, and there were still others dark-red, tawny-brown, and fox-yellow. Whirling and wheeling around the little point of flame, they dashed it out, and crawled all over the boy until he felt stifled and smothered with the heat of their clinging bodies.

      Suddenly he felt a stinging pain in his bare shoulder and in one of his exposed feet. As he threw out his hands desperately, tiny clicking teeth cut the flesh of wrists and arms. The scent of blood seemed to madden the whole company of these deaths-in-the-dark, and, although the actual bites were made by the little vampire-bats, yet at the sight of them feasting, the other night-fliers descended upon the boy like a black cloud and clustered around the little wounds, as Will had seen moths gather around syrup spread on trees of a warm June night.

      The sting of their bites lasted for only a second, and the flapping of their wings made a cool current of air which seemed to drug his senses. Dreamily he felt them against him, knew that they were draining his life, yet lacked the will-power to drive them away. Suddenly there flashed into his mind all that he had heard and read of the deadly methods of these dark enemies of mankind. With a shriek, he threw out his arms through the furry cloud that hung over him and sprang out of his hammock.

      At his scream, Professor Ditson rushed in with a flash-light, followed by Pinto, Hen, and Joe, while Jud slept serenely through the whole tumult. They found Will dripping with blood from a dozen little punctures made by the sharp teeth of the bats, and almost exhausted from fright and the loss of blood. Then came pandemonium. Seizing sticks, brooms, machetes, anything that came to hand, while Will sank back into his hammock, the others attacked the bats. Lighted by the flash of Professor Ditson's electric light, they drove the squeaking, shrieking cloud of dark figures back and forth through the little room until the last one had escaped through the torn netting or was lying dead on the floor.

      Twenty-seven bats altogether were piled in a heap when the fight was over.

      CHAPTER IV

      Death River

      At last their first week in this new world of beauty and mystery came to an end. At Belem they boarded a well-appointed steamer and embarked for the thousand-mile voyage to Manaos, which is only six degrees from the equator and one of