YES, they had listened very attentively the day before when Uncle Paul told them all about poisonous plants. Who would not listen to a talk on flowers? Jules and Claire, however, would have been glad to hear more. How are the flowers made that their uncle showed them yesterday? What is to be seen inside them? Of what use are they to the plant? Under the big elder-tree in the garden their uncle talked to them as follows: “Let us begin with the blossoms of the digitalis, which I spoke of yesterday. Here is one. It has, as you see, almost the form of a glove-finger, or better, of a long pointed cap. Emile could put one on to his little finger; there would be plenty of room. It is purplish-red in color. Inside, it has spots of dark red encircled with white. The red glove-finger rises from the center of a circle of five little leaves. These little leaves are also part of the flower. Together they form what is called the calyx. The rest, the red part, is called the corolla. Remember these words, which are new to you.” “The corolla is the colored part of the flower; the calyx is the circle of little leaves at the base of the corolla,” repeated Jules. “Most flowers have two envelopes like these, one within the other. The exterior, or calyx, is nearly always green; the interior, or corolla, is embellished with those magnificent tints that please us in so many flowers. [Illustration: Mallow] “In the mallow, which you see here, the calyx consists of five little green leaves, and the corolla of five large pieces of lilac rose-color. Each of these pieces is called a petal. The petals, all together, make the corolla.” “The corolla of the digitalis has only one piece or petal; that of the mallow has five,” remarked Claire. “It looks that way at first, but on examining closely you will find that they both have five. I must tell you that in a great many flowers the petals unite as soon as they begin to form in the bud, and by their union constitute a corolla which looks like only one piece. But very often the united petals separate a little at the edge of the flower, and by indentations more or less deep show how many are joined together. “Look at this tobacco blossom. The corolla forms a tun-bellied funnel, apparently composed of only one piece. But the edge of the flower is cut out in five similar parts, which are the extremities of so many petals. The tobacco blossom, then, has five petals, the same as the mallow; only, these five petals, instead of being separate all their length, are welded together in a sort of funnel. [Illustration: Tobacco] “Corollas with separate petals are called polypetalous corollas.” “Like that of the mallow,” suggested Claire. “And that of the pear, almond, and strawberry,” added Jules. “Jules forgets some very pretty ones: the pansy and violet,” said Emile. “Corollas with petals all joined together are called monopetalous corollas,” continued Uncle Paul. “For example, digitalis and tobacco,” said Jules.