I

THERE ARE JUST TWO KINDS OF LEAVES

A GOOD many things were ripe in August, and some of the things were through blooming. Prue did not plant a great deal. It was too hot to dig long in the sun, and then there did not seem to be much in the way of flowers that could be planted so late. Davy planted a few turnips and some late beans and salad, because there was time for these, but even Davy found it pleasanter to sit in the shade, where there was a breeze, and pull plants to pieces and talk about Exogens and Endogens and the different parts of things, than to hoe and dig and rake on an August day.

The Chief Gardener heard quite loud voices under the peach-trees, one warm afternoon. Prue and Davy were not really quarreling, but they seemed to be a good deal in earnest about something. The Chief Gardener went over there.

"What is all the excitement?" he asked.

Davy held up and waved a large stem of very coarse grass.

"It's an Endogen," he said, very decidedly, "isn't it, Papa?"

"It isn't at all, is it, Papa?" eagerly asked little Prue.

The Chief Gardener took the plumey stem and sat down.

"Why do you think it is an Endogen, Davy?" he asked.

"Because it's a grass, and belongs to the grass family. And corn belongs to the grass family, too, and corn is an Endogen, for it has a big pith instead of rings. So if corn is an Endogen, grass is, too."

The Chief Gardener smiled.

"Well, that's pretty good, Davy, and is true enough, but it isn't just the best way to reason. Now, Prue, why did you think it was an Exogen?"

"Because the stem is hollow, and makes a ring when you cut off a little slice of it, and because the bloom part is in five pieces."

"Sharp eyes," nodded the Chief Gardener, "but Davy is right. There is not always a pith in the endogens. Pipe-stems and fish-poles are hollow, but the cane we make them of is an Endogen, too. And as for the bloom part of this grass, it is a sort of a tassel, like that of the corn. The real blooms are very tiny—too small for us to examine. And then, perhaps, some insect or bird has nipped some of it away. I think I must tell you a little more about leaves, so Davy won't have to know that grass is an Endogen because corn is, and so you won't be mistaken. Suppose, Davy, you try to tell me how many kinds of leaves there are."

Davy looked quite helpless.

"It would take a hundred years," he said.

"Why, no," said Prue. "There are just two kinds. Exogens and Endogens."

Davy laughed, and the Chief Gardener laughed with him.

"But you are right, Prue, in one way," he said. "There are just two kinds of leaves—simple and compound. A simple leaf is a leaf of just one blade, like a grass leaf, or the leaf of a morning-glory. A compound leaf is a leaf made up of several blades, like a bean leaf, which you know is divided into three parts. Of course, there are hundreds of shapes and thousands of species of leaves, but there are just two great kinds, simple and compound. Suppose, Davy, you look about and bring me three compound leaves, and you, Prue, try to find three simple leaves, and let's see what they are."

The children jumped up quickly, and wandered out into the sunny garden, looking as they went. The Chief Gardener heard them chatting, as they looked this way and that. Presently they returned with what they had found. Little Prue climbed up in his lap.

"Look at mine first!" she said, holding them out, and fanning herself with her little hat.

Davy sat down by them, and looked his collection over to be sure they were right.

"Well, Prue, let's see what you have," began the Chief Gardener. "One peach leaf—that's simple enough. Then here's a lily leaf—that's simple, too. But what's this? It looks as if it came from a Virginia creeper. But where's the rest of it? That's only part of a leaf."

"I told Prue that," said Davy, "and I brought a whole one for one of my compound leaves."

Davy held up what he had brought. The Chief Gardener took the stem of the Virginia creeper. Branching from it were five little stems with a small leaf on each. Prue had taken one of these to be a complete leaf, when it was really only a part of one compound leaf divided into five parts.

"You see, Prue, there is only one stem that joins the main stalk," explained the Chief Gardener. "Whatever branches out from that stem is a part of that leaf. What else have you brought, Davy?"

Davy held up a blackberry leaf, and the leaf of a tomato.

"Those are both right," said the Chief Gardener. "The blackberry has three parts like the bean, and the tomato has a good many parts. There are some leaves that are compounded as many as four times—each little stem being compounded over and over until there are hundreds of little parts, and yet all are connected with the main leaf-stem which joins the stalk or branch, making really only one leaf. Of course, it is not always easy to tell about leaves, any more than about flowers. Sometimes shapes are so peculiar that it is almost impossible to tell just what they are. Pine-needles are leaves, but it is hard to tell whether they are simple or compound, and it would be hard to tell whether the pine was an Exogen or an Endogen if we had only the needles to go by."

"But you haven't told us how to tell that by the leaves at all," said Davy. "That is what we started to find out."

"That's so, Davy. It's hard to keep to the subject in botany. There are so many things, and all so interesting."

The Chief Gardener took up the lily leaf and that of the blackberry, and held them up to the light.

"Do you see the difference?" he asked.

"Why, yes," said Prue, "the blackberry is all criss-crossy, and the lily leaf runs straight and smooth."

"Those are the veins," said Davy; "I heard Mamma say so."

"Yes, they are the veins," nodded the Chief Gardener, "and when they form a network, or run criss-crossy, as Prue says, it means that the plant is an Exogen. When they run side by side smoothly, as they do in corn and grass, it means that the plant is an Endogen. There are a few of both kinds which do not quite follow this rule, like the pine-tree, which is an Exogen, but has its little straight-grained needles, or like smilax, which has netted leaves, but is an Endogen."

II

SOMETIMES I THINK PLANTS CAN SEE AND HEAR

It was about a week after this that Davy and Prue came to the Chief Gardener with their hands filled with leaves.

"We want you to tell us about them," they said. "There is a lot of kinds and shapes, and some we can't tell whether they are simple or compound, or anything."

The Chief Gardener looked over their collection.

"Well," he said, "I am afraid you are getting ahead too fast. It would take a real sure-enough botanist to tell all about these leaves."

Davy picked up a daisy leaf.

"Is that simple or compound?" he asked.

"It's mostly ribs," laughed the Chief Gardener. "There really isn't much leaf about a daisy leaf, but what there is of it is simple, only it is so cut and sprangly that it might almost be called a compound leaf."

They looked at many others in the collection, and the Chief Gardener explained as far as he could.

"You will learn all the names of the different shapes some day," he said, "but it is too much for little folks. I suppose, though, you might remember the parts of a leaf. They are the blade, the stem, and the stipules."

"This is the blade, and this is the stem," said Davy, "but what are stipules?"

The Chief Gardener picked up a red clover leaf, and pointed to a little thin pale-green husk where the stem joined the main stalk.

"Those are stipules," he said. "In the clover they grow together, as one. The stipules are a part of the outside of the leaf-bud. When the bud opens, and the leaf goes out into the world, the stipules stay behind. Sometimes they are like little leaves, and take up air for the plant, just as the leaves do. Sometimes they almost take the place of leaves, and are quite large. Sometimes they are very tiny, and some plants have no stipules at all."

"But leaves have veins, too," said Davy.

"Those are parts of the blade. The blade has ribs—they make a framework which holds it together; also veins—the fine threads which help to carry the sap. You see, plants are a good deal like ourselves, and live much in the same way. Some leaves have only one strong rib through the center—a sort of a backbone. Some have as many as six or seven."

They talked about these things, and looked at the different leaves and stems. Then they spoke of the stalks of different plants, and the Chief Gardener explained how the tender stalk of the lowliest plant, that of the tall twining vine, and the trunk of the giant oak, were all one and the same, only different in kind. Each came at some time from a tiny seed. Each put forth buds and leaves and branches. Each was made to withstand the storm—the oak by its strength, the vine by its fast hold on the wall or lattice, the tender plant through its lowliness.

"Oh," said Davy suddenly, "that makes me think of something. Our Virginia creeper on the front lattice has three ways to climb."

"What are they, Davy?"

"Why, it twists, for one way."

"Twines, you mean."

"Yes, twines, and then it has little curlers, like a grape-vine."

"Tendrils, they are called, Davy."

"And little clingers, like an ivy."

"Feet, you should say. Yes, I have noticed that. A lattice is not very well suited to a Virginia creeper, and ours has to try every way known to vines, to hold on. I have never known all three ways on one vine before. But vines are very curious things. Sometimes I think they can see and hear. I know they can feel, for a honeysuckle shoot will grow perfectly straight until it touches something that can be climbed. Then it will begin to twist so fast you can almost see it."

"But why do you think they can see and hear?" asked little Prue.

"I don't know that I do really think so, but I have tried every way I can think of to keep those morning-glories of yours from running up my little pear-tree. I have pushed them away, and tied them away, and I have even cut some of them away. But if I turn my back for a day, or even a half a day, there is one of them starting up the stalk, or, at least, reaching out for it as hard as ever it can."

Little Prue laughed, and ran over to see. Yes, there it was—a fuzzy green shoot half-way up the little pear-tree, and three more reaching out in the same direction.

"A vine will grow in the direction of a tree or shrub, if it is half way across the garden from it. Whether it hears or sees, or, perhaps, smells it, I do not know. Some vines will turn out of their way for a drink."

"For a drink! Oh, Papa!"

"Yes, certain melon vines. In dry weather they will turn to find a pan of water set several feet away. I suppose they can sense the moisture from it."

The children talked the rest of the afternoon about these curious things. They found where a scarlet runner had traveled several feet through the grass to reach a peach-tree, and had climbed far up into its branches. Then Davy happened to remember the story about the vines which the Chief Gardener had told them during the winter, and told it all over to little Prue—how the honeysuckle had laughed at the scarlet runner and the morning-glory, and had been punished by being made to twine to the left, away from the sun, instead of to the right, toward it, like the morning-glory and the bean. So the happy summer day passed, and in the cool of the evening big Prue came out to watch the sun go down, and in the pleasant arbor they all had tea together.

III

THERE ARE PLANTS WHICH DO NOT BLOOM

But during the last two weeks of August the Chief Gardener and big Prue and little Prue and Davy all went to the seashore, which was not far away. They lived in a pretty cottage near the beach, and there were meadows behind that stretched away to the blue hills. Davy and Prue loved the sea, with all its curious shells and star-fishes and other wonderful creatures. They loved the white sand, where they found these things, and where the great waves billowed and broke over them when they bathed on hot afternoons. They loved the meadows, too, for here there were birds building in the grass, and flowers unlike any in their gardens, and little streams of clear water that went singing to the sea.

It was when they came from the meadow one afternoon, that they hurried to the Chief Gardener with the little basket which they always carried.

"We have found some things," said Davy, "and want you to look at them."

The Chief Gardener took the basket. On top were some mushrooms—two kinds. One had whity-brown tops, and was pink or brown or almost black underneath, while the other had yellow tops with white spots on them, and was very pale underneath. The Chief Gardener looked sharply at the children when he saw these yellow mushrooms.

"Go and wash your hands, quickly," he said, "and I hope neither of you have put your hands to your mouth since you touched these."

"I haven't," said Davy, "and I picked the yellow ones."

"They are deadly poison," said the Chief Gardener, "they are called the Amanita, and even to touch the tongue with your fingers after handling them might make you very ill. The others are meadow mushrooms and harmless. But even they could not be eaten after being in the basket with the Amanitas."

The children ran to wash their hands, and were presently back to ask questions. Meantime the Chief Gardener had found a lot of beautiful moss and ferns in the bottom of the basket, and some lichens, which the children had gathered from a rocky cliff not far away.

"Papa, aren't mushrooms toad-stools, and don't they build them to sit on, in pleasant weather, and to get under, when it rains?"

This was little Prue, and she was quite excited.

"I think they are some kind of plants," said Davy, "but I don't see where the flowers are, or how they make seeds."

"How about the ferns?" asked the Chief Gardener. "Did you find any flowers on the ferns?"

"No, but we found seeds."

Davy turned one of the fern leaves over, and, sure enough, there were a lot of little brown seeds under the ends of some of the leaflets. Then the Chief Gardener turned over one of the meadow mushrooms, and divided the little layers beneath with the tip of his pencil.

"That is where the mushroom keeps its seeds, too," he said. "We do not call them seeds, though, but spores. Fern seeds are called spores, also."

"But toads do sit under mushrooms, don't they?" insisted little Prue.

"Why, yes, I suppose a great many toads have done that, but they are really plants, as Davy says."

Davy had become thoughtful.

"Are they Exogens?" he asked, "or Endogens? I should think the mushrooms might be Endogens from their stems, and the fern Exogens from their leaves."

"Well, Davy, that is very well said, but they are really neither one. They belong to a great class of their own. Exogens and Endogens are only the two kinds of flowering plants. These mushrooms and ferns and mosses and lichens all belong to the flowerless plants, and are called Crip-tog-a-mous—a very long word, which I do not expect you to remember. The divisions of flowerless plants are too hard a study for little folks, but the plants are all very interesting, and we can gather them, and see how they grow. In fact, I think we will have to call our meadow and our beach your August garden."

"But there isn't anything on the beach," said Prue.

"How about all that seaweed you were gathering yesterday?"

"But does that really grow like our plants on the shore?" asked Davy.

"Very much the same, and it belongs to the flowerless class, too, along with the mosses and lichens and ferns and mushrooms. It has spores instead of seeds, and is really a sort of a moss of the sea."

"Oh, call us not weeds, we are flowers of the sea,

For lovely and bright and fresh-tinted are we,"