After breakfast, Professor Amandus Ditson called the party together for a conference in a wide, cool veranda on the ground floor.

"I should like to outline to you my plan of our expedition," he announced precisely.

Jud gave an angry grunt. The old adventurer, who had been a hero among prospectors and trappers in the Far North, was accustomed to be consulted in any expedition of which he was a member.

"It seems to me, Professor Ditson," he remarked aggressively, "that you're pretty uppity about this trip. Other people here have had experience in treasure-huntin'."

"Meaning yourself, I presume," returned Professor Ditson, acidly.

"Yes, sir!" shouted Jud, thoroughly aroused, "that's exactly who I do mean. I know as much about—ouch!" The last exclamation came when Jud brought down his open hand for emphasis on the side of his chair and incidently on a lurid brown insect nearly three inches in length, with enormous nippers and a rounded body ending in what looked like a long sting. Jud jerked his hand away and gazed in horror at his threatening seat-mate.

"I believe I'm stung," he murmured faintly, gazing anxiously at his hand. "What is it?"

"It would hardly seem to me," observed Professor Ditson, scathingly, "that a man who is afraid of a harmless arachnid like a whip-scorpion, and who nearly falls out of a canoe at the sight of a manta-ray disporting itself, would be the one to lead an expedition through the unexplored wilds of South America. We are going into a country," he went on more earnestly, "where a hasty step, the careless touching of a tree, or the tasting of a leaf or fruit may mean instant death, to say nothing of the dangers from some of the larger carnivora and wandering cannibals. I have had some experience with this region," he went on, "and if there is no objection, I will outline my plan."

There was none. Even Jud, who had removed himself to another chair with great rapidity, had not a word to say.

"I propose that we take a steamer by the end of this week to Manaos, a thousand miles up the Amazon," continued the professor. "In the meantime, we can do some hunting and collecting in this neighborhood. After we reach Manaos we can go by boat down the Rio Negros until we strike the old Slave Trail which leads across the Amazon basin and up into the highlands of Peru."

"Who made that trail?" inquired Will, much interested.

"It was cut by the Spanish conquerors of Peru nearly four hundred years ago," returned the scientist. "They used to send expeditions down into the Amazon region after slaves to work their mines. Since then," he went on, "it has been kept open by the Indians themselves, and, as far as I know, has not been traversed by a white man for centuries. I learned the secret of it many years ago, while I was living with one of the wilder tribes," he finished.

The professor's plan was adopted unanimously, Jud not voting.

Then followed nearly a week of wonderful hunting and collecting. Even Jud, who regarded everything with a severe and jaundiced eye, could not conceal his interest in the multitude of wonderful new sights, sounds, and scents which they experienced every day. As for Will, he lived in the delightful excitement which only a bird-student knows who finds himself surrounded by a host of unknown and beautiful birds. Some of them, unlike good children, were heard but not seen. Once, as they pushed their way in single file along a little path which wound through the jungle, there suddenly sounded, from the dark depths beyond, a shriek of agony and despair. In a moment it was taken up by another voice and another and another, until there were at least twenty screamers performing in chorus.

"It's only the ypicaha rail," remarked the professor, indifferently.

Hen Pine, who was in the rear with Will, shook his head doubtfully.

"Dis ol' jungle," he whispered, "is full o' squallers. De professor he call 'em birds, but dey sound more like ha'nts to me."

Beyond the rail colony they heard at intervals a hollow, mysterious cry.

"That," explained Pinto, "is the Witch of the Woods. No one ever sees her unless she is answered. Then she comes and drives mad the one who called her."

"Nice cheery place, this!" broke in Jud.

"The alleged witch," remarked Professor Ditson severely, "happens to be the little waterhen."

Later they heard a strange, clanging noise, which sounded as if some one had struck a tree with an iron bar, and at intervals from the deepest part of the forest there came a single, wild, fierce cry. Even Professor Ditson could not identify these sounds.

"Dem most suttinly is ha'nts," volunteered Hen. "I know 'em. You wouldn't catch dis chile goin' far alone in dese woods."

One of the smaller birds which interested Will was the many-colored knight, which looked much like one of the northern kinglets. His little body, smaller than that of a house-wren, showed seven colors—black, white, green, blue, orange, yellow, and scarlet, and he had a blue crown and a sky-blue eye. Moreover, his nest, fastened to a single rush, was a marvel of skill and beauty, being made entirely of soft bits of dry, yellow sedge, cemented together with gum so smoothly that it looked as if it had been cast in a mold. Then there was the Bienteveo tyrant, a bird about nine inches long, which caught fish, flies, and game, and fed on fruit and carrion indiscriminately. It was entirely devoted to its mate, and whenever a pair of tyrants were separated, they would constantly call back and forth to each other reassuringly, even when they were hunting. When they finally met again, they would perch close to each other and scream joyously at being reunited. Another bird of the same family, the scarlet tyrant, all black and scarlet, was so brilliant that even the rainbow-hued tanagers seemed pale and the jeweled humming-bird sad-colored in the presence of "coal-o'-fire," as the Indians have named this bird.

Jud was more impressed with the wonders of the vegetable kingdom. Whenever he strayed off the beaten path or tried to cut his way through a thicket, he tangled himself in the curved spines of the pull-and-haul-back vine, a thorny shrub which lives up to its name, or was stabbed by the devil-plant, a sprawling cactus which tries quite successfully to fill up all the vacant spaces in the jungle where it grows. Each stem of this well-named shrub had three or four angles, and each angle was lined with thorns an inch or more in length, so sharp and strong that they pierced Jud's heavy hunting-boots like steel needles. If it had not been for Hen, who was a master with the machete, Jud never would have broken loose from his entanglements. Beyond the cactus, the old trapper came to a patch of poor-man's plaster, a shrub with attractive yellow flowers, but whose leaves, which broke off at a touch, were covered on the under side with barbed hairs, which caught and clung to any one touching them. The farther Jud went, the more he became plastered with these sticky leaves, until he began to look like some huge chrysalis. The end came when he tripped on a network of invisible wires, the stems of species of smilax and morning-glory, and rolled over and over in a thicket of the plasters. When at last he gained his feet, he looked like nothing human, but seemed only a walking mass of green leaves and clinging stems.

"Yah, yah, yah!" roared Hen. "Mars' Jud he look des like Br'er Rabbit did when he spilled Br'er Bear's bucket o' honey over hisself an' rolled in leafs tryin' to clean hisself. Mars' Jud sure look like de grand-daddy ob all de ha'nts in dese yere woods."

"Shut up, you fool darky," said Jud, decidedly miffed. "Come and help unwrap me. I feel like a cigar."

Hen laughed so that it was with difficulty that he freed Jud, prancing with impatience, from his many layers of leaves. Later on, Hen showed himself to be an even more present help in trouble. The two were following a path a short distance away from the rest of the party, with Jud in the lead. Suddenly the trapper heard the slash of the negro's machete just behind him, and turned around to see him cutting the head from a coiled rattlesnake over which Jud had stepped. If Jud had stopped or touched the snake with either foot, he would most certainly have been bitten, and it spoke well for Hen's presence of mind that he kept perfectly quiet until the danger was over. This South American rattlesnake had a smaller head and rougher scales than any of the thirteen North American varieties, and was nearly six feet in length. Professor Ditson was filled with regret that it had not been caught alive.

"Never kill a harmless snake," he said severely to Hen, "without consulting me. I would have been glad to have added this specimen to the collection of the ZoÖlogical Gardens."

"Harmless!" yelled Jud, much incensed. "A rattlesnake harmless! How do you get that way?"

"He didn't do you any harm, did he?" retorted the professor, acidly. "It is certainly ungrateful of you to slander a snake just after he has saved your life."

"How did he save my life?" asked Jud.

"By not biting you," returned Professor Ditson, promptly.

A little later poor Jud had a hair-raising experience with another snake. He had shot a carancha, that curious South American hawk which wails and whines when it is happy, and, although a fruit-eater with weak claws and only a slightly hooked beak, attacks horses and kills lambs. Jud had tucked his specimen into a back pocket of his shooting-jacket and was following a little path which led through an open space in the jungle. He had turned over his shot-gun to Joe, and was trying his best to keep clear of any more tangling vines, when suddenly right beside him a great dark snake reared its head until its black glittering eyes looked level into Jud's, and its flickering tongue was not a foot from his face. With a yell, Jud broke the world's record for the back-standing broad-jump and tore down the trail shouting, "Bushmaster! bushmaster!" at the top of his voice. As he ran he suddenly felt a sharp pain in his back.

"He's got me!" he called back to Hen Pine, who came hurrying after him. "Ouch! There he goes again!" and he plunged headlong into a patch of pull-and-haul-back vine, which anchored him until Hen came up.

"Dat ain't no bushmaster, Mars' Jud," the latter called soothingly. "Dat was only a trail-haunting blacksnake. He like to lie next to a path an' stick up his ol' head to see who's comin', kin' o' friendly like."

"Friendly nothin'!" groaned Jud. "He's just bit me again."

As soon as Hen laid hold of Jud's jacket he found out what was the matter. The hawk had only been stunned by Jud's shot and, coming to life again, had promptly sunk his claws into the latter's back, and Jud had mistaken the bird's talons for the fangs of the bushmaster. Professor Ditson, who had hurried up, was much disappointed.

"If you ever meet a bushmaster, you'll learn the difference between it and a harmless blacksnake," he observed. "Probably, however," he went on thoughtfully, "it will be too late to do you much good."

"Why do all the snakes in South America pick on me?" complained Jud. "There don't seem to be nothin' here but snakes an' thorns."

It was Pinto who gave the old trapper his first favorable impression of the jungle. They had reached a deserted bungalow in the heart of the woods, which Professor Ditson had once made his headquarters a number of years before. There they planned to have lunch and spend the night. At the meal Jud showed his usual good appetite in spite of his misfortunes, but he complained afterward to Hen, who had attached himself specially to the old man, about the absence of dessert.

"I got a kind of a sweet tooth," he said. "You ain't got a piece of pie handy, have you?"

"No sah, no sah," replied Hen, regretfully. "You's about three thousand miles south ob de pie-belt."

"Wait," broke in Pinto, who had been listening. "Wait a minute; I get you something sweet," and he led the way to an enormous tree with reddish, ragged bark. Some distance up its trunk was a deep hollow, out of which showed a spout of dark wax nearly two feet long. In and out of this buzzed a cloud of bees.

"I get you!" shouted Jud, much delighted, "a bee-tree! Look out, boy," he went on, as the Indian, clinging to the ridges of the bark with his fingers and toes, began to climb. "Those bees'll sting you to death."

"South American bees hab no sting," explained Hen, as Pinto reached the wax spout, and, breaking it off, thrust his hand fearlessly through the cloud of bees into the store of honey beyond. A moment later, and he was back again, laden with masses of dripping honeycomb, the cells of which, instead of being six-sided, as with our northern bees, resembled each one a little bottle. The honey was clear and sweet, yet had a curious tart flavor. While Jud was sampling a bit of honeycomb, Pinto borrowed Hen's machete and cut a deep gash through the rough red bark of the tree. Immediately there flowed out from the cut the same thick, milky juice which they had seen at their first breakfast in South America. The Indian cut a separate gash for each one of the party, and they all finished their meal with draughts of the sweet, creamy juice.

"It sure is a land flowing with 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.