With this he darted away. Watching him they saw him alight on the top of Farmer Brown's barn. “It's funny,” remarked Johnny Chuck, “but as long as I've known Forktail, and I've known him ever since I was big enough to know anybody, I've never found out how he builds his nest. I've seen him skimming over the Green Meadows times without number, and often he comes here to the Old Orchard as he did just now, but I've never seen him stop anywhere except over on that barn.” “That's where he nests,” chuckled Skimmer. “What?” cried Johnny Chuck. “Do you mean to say he nests on Farmer Brown's barn?” “No,” replied Skimmer. “He nests in it. That's why he is called the Barn Swallow, and why you never have seen his nest. If you'll just go over to Farmer Brown's barn and look up in the roof, you'll see Forktail's nest there somewhere.” “Me go over to Farmer Brown's barn!” exclaimed Johnny Chuck. “Do you think I'm crazy?” Skimmer chuckled. “Forktail isn't crazy,” said he, “and he goes in and out of that barn all day long. I must say I wouldn't care to build in such a place myself, but he seems to like it. There's one thing about it, his home is warm and dry and comfortable, no matter what the weather is. I wouldn't trade with him, though. No, sir, I wouldn't trade with him for anything. Give me a hollow in a tree well lined with feathers to a nest made of mud and straw, even if it is feather-lined.” “Do you mean that such a neat-looking, handsome fellow as Forktail uses mud in his nest?” cried Johnny. Skimmer bobbed his head. “He does just that,” said he. “He's something like Welcome Robin in this respect. I--” But Johnny Chuck never knew what Skimmer was going to say next, for Skimmer happened at that instant to glance up. For an instant he sat motionless with horror, then with a shriek he darted out into the air. At the sound of that shriek Mrs. Skimmer, who all the time had been sitting on her eggs inside the hollow of the tree, darted out of her doorway, also shrieking. For a moment Johnny Chuck couldn't imagine what could be the trouble. Then a slight rustling drew his eyes to a crotch in the tree a little above the doorway of Skimmer's home. There, partly coiled around a branch, with head swaying to and fro, eyes glittering and forked tongue darting out and in, as he tried to look down into Skimmer's nest, was Mr. Blacksnake.