Although Eve and Petro did not fly off to the plaster pit together, they did not go alone, for there was a whole colony of swallows building under the eaves of that same barn; and while some of them stayed and plastered, the rest flew forth for a fresh supply.
They knew the place, every one of them; and swiftly over the meadow and over the marsh they flew, until they came to a pasture. There, near a spring where the cows had trampled the ground until it was oozy and the water stood in tiny pools in their hoof prints, the swallows stopped. They put down their beaks into the mud and gathered it in their mouths; and all the time they held their wings quivering up over their beautiful blue backs, like a flock of butterflies just alighting with their wings atremble.
So their plaster pit was just a mud-puddle. Yes, that is all; only it had to be a particularly sticky kind of mud, which is called clay; for the walls of their homes were a sort of brick something like that the people made in Egypt years and years ago. And do you remember how the story goes that the folk in Pharaoh's day gathered straws to mix with the clay, so that their bricks would be stronger? Well, Eve and Petro didn't know that story, but they gathered fibres of slender roots and dead grass stems with their clay, which doubtless did their brick plaster no harm.
At Work in the Plaster Pit.
Men brick-makers nowadays bake their bricks in ovens called kilns, which are heated with fire. Eve and Petro let their brick bake, too, and the fire they used was the same one the Egyptians used in the days of Pharaoh—a fire that had never in all that time gone out, but had glowed steadily century after century, baking many bricks for folk and birds. Of course you know what fire that is, for you see it yourself every day that the sun shines.
Every now and again Eve and Petro and all the rest of the swallow colony left off their brick-building and went on a hunting trip. They hunted high in the air and they hunted low over the meadow. They hunted afar off along the stream and they hunted near by in the barnyard. And all the game they caught they captured on the wing, and they ate it fresh at a gulp without pausing in their flight. As they sailed and swirled, they were good to watch, for a swallow's strong long wings bear him right gracefully.
Why did they stop for the hunting flight? Perhaps they were hungry. Perhaps their mouths were tired of being hods for clay they could not eat. Perhaps the fresh plaster on the walls of their homes needed time to dry a bit before more was added.
Be that as it may, they made the minutes count even while they rested from their building work. For they used this time getting their meals; and whenever they were doing that, they were working for the owner of the barn, paying their rent for the house-lot on the wall by catching grass insects over the meadow, and mosquitoes and horseflies and house-flies by the hundreds, and many another pest, too.
