It is said that the trout become fat and good-flavored when the May flies emerge, they eat so many of them. And what the fish do not catch the birds try to. Swallows and other insect-loving birds have a glorious feast when the May flies come out. For a season they live in the midst of more delicacies than they can possibly use. Fish like the May fly larvae, too, which is probably the reason the larvae have learned to live in the mud, out of reach. Fishermen dig up the larvae for bait, so you see the May flies have a hard time to get safely through the world. But in spite of difficulties a great many of them live, and some summer day out they come trooping. They spring all at once from the surface of the water as by magic, hundreds and thousands, yes, millions of them. They fill the air, they cover everything. The great naturalist Swammerdam, who was the first to make a thorough study of the May flies, thus tells us how they appeared in France one year:-- "I then saw a sight beyond all expectation. The ephemerae filled the air like the snowflakes in a dense snowstorm. "The steps were covered to a depth of two, three, or even four inches. A tract of water five or six feet across was completely hidden, and as the floating insects slowly drifted away, others took their places. Several times I was obliged to retreat to the top of the stairs from the annoyance caused by the ephemerae, which dashed in my face, and got into my eyes, mouth, and nose." These swarms of May flies appear only from three to five days at a time. Wherever there are streams there are May flies, and the canals of Holland make good breeding places for them; no wonder, then, the Dutch, who you know live in Holland, have a saying, "As thick as May flies." Although so many of the May flies perish at once, multitudes of them drop their eggs into the water to renew the race of May flies. Is it not wonderful that after so long a period of creeping about in the mud as larvae, these graceful and beautiful little creatures have but a few hours in which to dance joyously about in the upper air on wings of gossamer? Some, indeed, live less than an hour, and some, that come out in the evening, finish their dance of life and perish before sunrise, without ever having seen the beautiful daylight. Yes, strange little beings are they. They do us no harm and we should not kill them. Let them live their short lives and be happy. THE STONE FLY FOLK [Illustration] John has been fishing. What do you think he caught? Nary fish, my dears, but a goodly number of stone flies, which he has brought to show us. Yes, Mollie, they do remind us a very little of our May flies, only, of course, they are many times larger. It is rather a clumsy creature in spite of its large wings, and John says he had no trouble whatever in catching it. See, it has four wings, and the hind ones are the larger. Yes, May, they fold up in plaits, like the sticks of a fan.