Part 4

"How can she run about on the sticky web without getting caught, too?" interrupts Mary.

I think a moment, then with some dignity reply: "Pretty soon, please, Mary."

Argiope, I repeat, rushed at once out upon the web, seized the fly in her jaws and ran back to the hub with it, where she appeared to wet it all over, squeeze it into a ball and then proceed to feed upon it, holding and manipulating it skillfully all the time in her jaws. Evidently Argiope was very hungry, for as you will see, this is not her usual way of taking care of her prey.

"Now, Mary, what was it you asked?"

"Oh, just how the spider can run around so fast on the web without sticking to it and getting caught or tearing it all to pieces."

"Ah,--ah, yes. Well, Mary, I don't know! that is, exactly; or, well not even very close to exactly. But she does it, you see."

"Yes, I see," said Mary, demurely, and--can it be that Mary is slightly winking one eye? I do hope not.

"Of course you know, Mary, that the web is made of two kinds of silk or rather two kinds of lines? Oh, you didn't know?" Mary has shaken her head.

"Well it is," I continue, with my usual manner of teacher-who-knows somewhat restored again. "The foundation lines, the radii and a first set of circles are all made of lines without any sticky stuff on them. As you see"--and I touch my pencil confidently to a radius, with the manner of a parlor magician. "Then the spider, on this foundation, spins in another long spiral, the present circles of the web, which is liberally supplied with tiny, shining droplets of viscid silk that never dries, but stays moist and very sticky all the time. This is the true catching part of the web."

"We surely must watch her spin a web sometime," breaks in eager Mary.

"We certainly must," say I, and continue. "Now perhaps when Argiope runs out on the web from her watching-place at the hub, she only puts her long delicate feet on the unsticky radii. Or perhaps her feet are made in some peculiar way so that they do not stick to the circles. As a matter of fact, a spider's foot is remarkably fashioned, with curious toothed claws, and hosts of odd hairs, some knobbed, some curved and hook-like, and some forming dense little brushes. But after all, Mary, the truth is, I don't know really how it is that spiders can run about over their webs without getting stuck to them."

After my long discursus about web-making and spider's feet, it seemed time to give Argiope another fly. Indeed her bright little black eyes seemed to Mary to be shining with eagerness for more fly, although she still had the remains of the first one in her jaws--gracious, Argiope's jaws, please, not Mary's!

So we tossed in another fly. We hope you won't think this cruel. But flies are what Argiope eats, and if she was out in the garden, she would be catching them, and, what is worse, they would not be the disgusting and dangerous house-flies and bluebottles that we feed her, but all sorts of innocent and beautiful little picture-winged flower-flies and pomace-flies and what not. House-flies and stable-flies and bluebottles are truly dangerous because they help spread human diseases, especially typhoid fever. So if we are to live safely they should be killed. Or, better, prevented from hatching and growing at all.

So we tossed in another fly. Argiope immediately dropped the nearly finished first fly into the web, ran out to the new one and pounced on it, seizing it with her fore legs. Then she doubled her abdomen quickly underneath her and there issued from the spinnerets at its tip a jet, a flat jet of silk, which was caught up by the hind feet and wrapped around the fly as it was rolled over and over by the front feet. She tumbled it about, all the time wrapping it with the issuing band of silk, until it was completely enswathed. Then she left it fastened in the web, went back to the hub, and resumed her feeding on the first fly. But soon she finished this entirely, dropped the wreck out of the web and went out and got the second fly, bringing it back to the hub to eat.

"But why," asked Mary, "does Argiope wrap the fly up so carefully in silk? Why not just kill it by biting, and then leave it in the web until she wants it?"

"Perhaps," I answer, "she wants to make it helpless before she comes to close quarters with it. You notice she holds it away from her body with her fore feet and pulls the silk band out far with her hind feet so that her body does not touch the fly at all while she wraps it. Perhaps she is not sure that it isn't a bee or some other stinging insect. It buzzes loud enough to make me think it a bee."

So Mary and I decided to try some experiments with our Argiope to find out, if possible, first, if she could tell a bee from a fly, and second, if so, whether she treated it differently, and third, why she wraps her prey up so carefully before coming to too close quarters with it. We feel quite proud of these experiments because we seemed to be doing something really scientific; and we know that Experimental Zoology, that is, studying animals by experimenting with them, is quite the most scientific thing going nowadays among professional naturalists. So here are our notes exactly as we wrote them during our experimenting. This is, of course, the correct manner for publishing real scientific observations, because it gives the critical reader a chance to detect flaws in our technique!

OUR NOTES ON THE BEHAVIOR OF ARGIOPE

"Nov. 18, 4:45 P.M.; released a fly in the cage. The spider pounced upon it, seized it with fore and third pair of legs, threw out a band of silk and enswathed it, tumbling it over and over with her hind feet about thirteen times, hence enswathed it in thirteen wrappings of silk. The fly was then disconnected from the web, the spider making but little attempt to mend the gap. It was carried to the hub and eaten. While the feast was going on, a honey-bee [with sting extracted; we didn't want to run any risks with Argiope!] was liberated in the cage. As soon as it touched the web, the spider was upon it, throwing out a band of silk in a sheet a quarter of an inch broad. ['Drawing out' would be more accurate, for the spinnerets cannot spurt out silk; silk is drawn out and given its band character by lightning-like movements of the comb-toothed hind feet.] With her hind legs Argiope turned the bee over and over twenty-five or twenty-six times, thus enswathing it with twenty-five or twenty-six wrappings of the silken sheet.

"No sooner was the bee enswathed than a second bee was liberated in the cage and caught in the web. This was treated by the spider like bee No. 1.

"Nov. 20, 8:15 A.M.; Argiope perfectly still in center of hub, feeding on bee No. 2. The only thing that reveals the feeding is a slight moving of the bee's body as the juices are sucked up. Remains of bee No. 1 dropped to the bottom of the cage.

"Fed all day, 8:15 A.M. to 5 P.M., on bee No. 2.

"At 2:30 P.M., a box-elder bug, which is very ill-smelling, was thrown into the web. Argiope did nothing for three minutes, then went out on the web to it and wrapped, making five complete turns; then went away. Probably not hungry, as she has had two bees and a fly in three days.

"Nov. 21, 8:15 A.M.; box-elder bug finished during last night. Old web replaced by a new one with twenty-nine radii, eleven complete spirals and several partial spirals. The hub is formed of fine irregular webbing about an inch and a half in diameter, without the viscid droplets that cover the spirals. An open space of about a half-inch intervenes between the hub and the beginning of the spirals.

"4:30 P.M.; liberated a fly in the cage. Argiope pounced upon it and began to eat immediately, not taking time or trouble to enswath it.

"While the fly was being devoured, we liberated a strong-smelling box-elder bug in the cage. It flew into the web. Argiope, by a quick movement, turned on the hub toward the bug and stood in halting position for eight seconds, then approached the bug slowly, hesitated for a second or two, then wrapped it about with five wrappings, halted again, and finally finished with five more wrappings. The bug was then attached to the web where it had first touched, the spider passing back to the center and resuming her meal.

"When the fly was finished, Argiope walked over to the bug, grasped it in her mandibles, walked up to the hub, turned herself about so that her head was downward, manipulated the bug with her fore and third pair of feet until it seemed to be in right position for her with reference to the hub of the web, and began to feed.

"5 P.M.; bee liberated in cage _with sting not extracted_. Argiope leaped instantaneously to the spot where it was caught, enswathed it with great rapidity thirty-seven times, then bit at it, and enswathed it five times more, making forty-two complete wrappings in all, then left it fastened in the web and resumed feeding upon the bug. All the time she was wrapping it, Argiope kept her body well clear of the bee's body, the spinnerets being fully one-half an inch from the bee, making the broad band of issuing silk very noticeable. In biting it, which she seemed to do with marked caution, she of course had to bite through the silken covering.

"A few minutes later a second bee, with sting, was liberated in the cage, caught in the web and rapidly pounced on by the spider. As before, she turned it over and over with great rapidity, using apparently all of her legs. She enswathed it fifty times, bit it, and then wrapped it with five more silken sheets, making fifty-five wrappings in all. Leaving it hung to the web, she went back to the bug.

"Before Argiope had reached the bug, bee No. 3 was caught in the web at the exact spot where bee No. 2 was hung up. In its efforts to disentangle its feet, it shook the whole web violently. In spite of the violent vibration of the web, Argiope pursued her course to the bug at the hub of the web, adjusted herself with head downward, and resumed feeding.

"Query: Did Argiope think the web-shaking due to futile struggles of the well-wrapped bee No. 2, and hence needing no attention?

"Vibration of the web continued. After several seconds had elapsed, Argiope seemed suddenly to realize that her efforts were called for out on the web, for she pounced down as rapidly as before and rolled and tumbled _both bees together_, enswathing both in the same sheet of silk, never stopping until she had given them fifty-five wrappings. After biting twice, she wrapped them with five more turns, bit again, and wrapped again with seven more turns, making sixty-seven in all. Argiope then returned to her bug.

"Query: Does Argiope distinguish bees from flies?

"Further query: Does Argiope distinguish bees _with stings_ from bees with _stings extracted_?

"Nov. 22, 9:45 A.M.; Argiope feeding at hub on bees Nos. 2 and 3 introduced into cage yesterday afternoon. With her right second leg she holds taut a line connected with bee No. 1.

"10:25 A.M.; packet dropped to the bottom of the cage, the juices of only one of the bees having been sucked out. The web is constructed at an angle so that anything dropped from the center falls free of it.

"5 P.M.; began feeding again on bee No. 1.

"Nov. 23, 9:30 A.M.; another bee released in cage, caught in web and enswathed approximately thirty turns by Argiope.

"Nov. 25, 8:30 A.M.; the web has been destroyed during the night.

"Nov. 26, Argiope has made an entirely new web.

"Nov. 30, 2 P.M.; gave Argiope a bee with sting. It was wrapped forty-seven times, but not so expeditiously as has been her wont. Later another bee was liberated in the cage, caught and wrapped about forty-five times.

"Dec. 2, 11 A.M.; the body of a live bee was bathed in fluid from the freshly crushed body of a box-elder bug [very malodorous], and the bee liberated in Argiope's cage, and soon caught in the web. The bee was not very lively and did not shake the web violently, but Argiope rushed to it without hesitation, wrapped it with twenty-five turns of silk and returned to the hub of the web.

"Dec. 3; Argiope stayed all day in the upper part of the web, on foundation lines, with head downward.

"Dec. 5; yesterday Argiope moved down to her normal place on the hub. To-day she is on the hub, but in reversed position [head up], and with legs bent and limp, not straight out and stiffened as usual.

"Dec. 6; Argiope hung all day from foundation lines of upper part of web, in reversed position [head up], with legs limp and bent.

"Dec. 7; Argiope hanging by first and second right legs, from upper part of web; barely alive.

"Dec. 8; Argiope dead."

THE ORANGE-DWELLERS

An entire colony of those strange little people, the Orange-dwellers, were killed in our town yesterday morning. And not a newspaper reporter found it out! Just one of the Orange-dwellers escaped, and as Mary and I were the means of saving his life, and are taking care of him as well as we can (Mary has him now on a small piece of orange-rind in a pill box), he has told us the story of his life and something about the other orange-dwelling people. Some of the Orange-dwellers live in Mexico; some live in Florida, and some in California; in fact they are to be found wherever oranges grow. Of course, you have guessed already that the Orange-dwellers are not human beings; they are not really people; they are insects.

The name of the Orange-dweller we had saved, and with whom we became very well acquainted, is so long and strange that I shall tell you merely his nickname, which is Citrinus. The oranges on which Citrinus and a great many of his brothers and sisters and cousins lived grew in Mexico, and when these oranges were ripe, they were gathered and packed into boxes and sent to our town. Imagine if you can the fearful strangeness of it! To have one's world plucked from its place in space, wrapped up in tissue-paper, and packed into a great box with a lot of other worlds; then sent off through space to some other place where enormous giants were waiting impatiently for breakfast! When Citrinus's world reached our town, one of these giants, who is my brother, took it up, and saying, "See, what a specked orange," straightway began unwittingly to kill all of the Orange-dwellers on it by vigorously rubbing and scraping it. For Citrinus and his companions were the specks! That is all an Orange-dweller seems to be when carelessly looked at; simply a little circular, scale-like, blackish or reddish-brown speck on the shining surface of the orange, his world. You can find the Orange-dwellers almost any morning at breakfast.

When my brother began to scrape off the specks, I hastily interfered, but only in time to save one of the little people, Citrinus, whom, as I have said, Mary has since faithfully cared for. He will soon die, however, for he has lived already nearly three months, and that is a ripe age for an Orange-dweller. But he has had time enough to tell me a great deal about his life, and as it is such a curious story, and is undoubtedly true, I venture to repeat it here to you. As a matter of fact I must confess--still Mary says that _of course_ Citrinus can talk, because he talks with other Orange-dwellers later in the story, and so of course can talk to us now.

Citrinus has lived for almost his whole life on the orange on which we found him. His mother lived on one of the fragrant leaves of the tree on which the orange grew. She was, as Citrinus is now, simply a reddish-brown circular speck on the bright-green orange-leaf; and because she couldn't walk, she had to get all her food in a peculiar way. She had a long (that is, long for such a tiny creature), slender, pointed hollow beak or sucking-tube, which she thrust right into the tender orange-leaf, and through which she sucked up the rich sap or juice which kept flowing into the leaf from the twig it hung on. She had thus a constant supply of food always ready and convenient; whenever she was hungry she simply sucked orange-sap into her mouth until she was satisfied. This is the way all the Orange-dwellers get their food, the very youngest of the family being able to take care of itself from the day of its birth. They never taste any other kind of food but the juice from the leaf or twig or golden orange on which they live.

Citrinus is one of a large number of brothers and sisters, more than fifty indeed, who were hatched from tiny reddish eggs which the mother laid under her own body. Before laying the eggs, Citrinus's mother had built a thin shell or roof of wax over her back, and after the eggs were laid she soon died and her body shriveled up, leaving the eggs safely housed under the waxen roof. When the baby Orange-dwellers were hatched, each had six legs and a delicate little sucking-beak projecting from his small plump body. Citrinus and his brothers and sisters scrambled out from under the wax shell and started out each for himself to explore the world. First, however, each thrust his beak into the leaf and took a good drink of sap. Then they were ready to begin their journeying. But a terrible thing happened!

Just as Citrinus was pulling his beak out of the soft leaf, he saw a great six-legged beast, in shape like a turtle, with shining red-and-black back and fearful snapping jaws. On each side of its head, which it moved slowly from side to side, it had an immense eye, which looked like a hemispherical window, with hundreds of panes of glass in it. The beast's legs were large and powerful, and on each foot there were two claws, each of them as long as the whole body of Citrinus. Truly this was an appalling sight, and all of the little Orange-dwellers ran as fast as they could, which, unfortunately, wasn't very fast. The beast leisurely caught up in its great jaws one after another of Citrinus's brothers and sisters, and crushed and tore their tender bodies to pieces and ate them!

Now this beast, which seemed so large to Citrinus, was what is to us a very small and pretty insect, one of the lady-bird beetles. These beetles care for no other food than plump Orange-dwellers and other equally toothsome small insects; and instead of being sorry for its victims, we are glad it eats them! This seems very cruel indeed, but there are so many, many millions of the Orange-dwellers all sucking the juice of orange-trees that although they are so small, and each one drinks so little sap, yet altogether they do a great amount of damage to the orange-trees, often killing all the trees in a large orchard. So the lady-birds are a great help to the orange-growers.

Little Citrinus escaped from the Beetle by crawling into a small, dark hole in the surface of the leaf; but he was badly frightened. This was his first experience with the terrible dangers of the world, with the struggle for life, which is going on so bitterly among the people of his kind, the insects. For although there would seem to be enough plants and trees to serve as food for all of them, many insects find it easier or prefer to eat other insects than to live on plant food. Now because the insects which live on plant food do injury to our fruit-trees and vegetables and grain crops by their eating, we call them injurious insects; while we call the insect-eating kinds beneficial insects, because they destroy the injurious insects.

But little Citrinus didn't look at the matter at all in this light. He thought the lady-bird beetle a very cruel and wicked being, and resolved to warn every Orange-dweller he met in his travels to beware of the cruel, turtle-shaped beast with the shining black-and-red back. As he wandered on from leaf to leaf along the tender twigs in the top of the tree, he met many other Orange-dwellers, whom he would have told all about the Beetle, but he found that all of them had had experiences as sad as his; in fact he soon learned that of all the Orange-dwellers who are born, only a very, very few escape the Beetles and other devouring beasts who pursue them. And he was highly indignant when one shrewd Orange-dweller told him that it really was a good thing for the race of Orange-dwellers that so many of them were killed. For, the shrewd Orange-dweller said, if all of us who are born should live and have families, and not die until old age came on, there would soon be so many of us that we should eat all the orange-trees in the world, and then we should all starve to death. And this is quite true.

Finally Citrinus came to a remarkable being, a very beautiful being indeed. It had two long, slender, waving feelers on its head, four large ball-shaped eyes, and, strangest of all, two delicate gauzy wings. This beautiful creature greeted Citrinus kindly and asked him where he was going. Citrinus, who was at first a little afraid of the strange creature, was reassured by its kind greeting, and answered simply, "I don't know. My brothers and sisters were all eaten by the Beetle; my father and mother I have never seen; and no one has told me where to go."

The stranger smiled a little sadly and said, "That is the common story among us Orange-dwellers. Our fathers and mothers always die before we are born. It is a great pity. Yes, before my little Orange-dweller children are born--"

"What," cried Citrinus, "are you an Orange-dweller; you, who are so different from me?"

"Indeed I am," replied the gauzy-winged creature. "I am an old Orange-dweller. Oh, I know it seems strange to you," he continued, noticing the look of astonishment on Citrinus's face, "but some day you will look just like me. You will have wings, and be able to fly; and will have long feelers on your head to hear and to smell with, and big eyes to see all around you with. You will have some strange experiences, though, before you become like me."

"But as I had started to say, we fathers, and the mothers too for that matter, always die before you youngsters are hatched out of your eggs. Now I shall probably die to-morrow or next day, because I have lived three days already, and that is a long time to live without eating."

Little Citrinus could hardly believe his senses. It was so wonderful. "But why don't you eat," urged Citrinus, who felt very badly to think of any one's going without food for three days. He always took a drink of sap every few minutes.

"Why, how absurd," replied the winged Orange-dweller, "don't you see I have nothing to eat with? No sucking-beak, no mouth at all. When I get my wings and my four eyes, I lose my mouth, and can't eat or drink any more."

This was incredible; but when Citrinus looked at the head of his companion, he saw it was perfectly true. He had no mouth. Citrinus gently waved his little sucking-beak, to be sure he still had it. Suddenly he began to cry; a sad thought had come to him. "And did my mother starve to death too?" he sobbed.