I followed down one of those sun-dried brook beds that melting snows from the hillsides had eroded during past ages. It proved a short journey to the Glen of Comus, descending northward toward Ball Brook in the vale below. I had not proceeded far when I discovered what at first sight seemed a robin’s nest, built high in the branches of the American Hornbeam,—or, as it is locally known, the Iron-Wood tree (_Carpinus Caroliniana_). It is the only American species of this genus in the Birch Family. Several saplings stood about fifteen feet high, two having so interlaced their branches as to form a strong crotch about eight feet from the ground. The nest was fashioned roughly, built of small sticks, and fastened in the crotch-like loft of these trees. Looking more closely, I perceived the nest was a third larger than the robin’s, and was not plastered with mud. I soon discovered that the bird upon the nest had blue tail feathers and a jaunty cadet top-knot, as she peeped over the edge of the nest at me. This was, then, the saucy jay’s nest, so seldom found about these woods. She became disturbed, and flew off down the ravine. I managed to climb up the trees high enough to determine that the eggs were still unhatched. The glen was dark here, and Major and I sat in the dim light beneath the shadows of this dense underwood. The jays began in chorus to scream unmercifully. They were distressed by Major’s presence, and flew saucily above his head. He scarcely knew what to make of it all,—not being a bird-dog,—and sat demurely looking at me and wagging his tail. Finally, tired of their own screaming, the jays proceeded down through the intricate windings of the hollow, and we heard their mutterings at a distance,—a pleasant wild sound through these forests. I looked carefully over the iron-wood trees. They are not uncommon hereabout. Their trunks are ridged and muscular in appearance. These trees are in fact very strong, possessing the endurance of the oak and beech. They never attain great height,—from fifteen to forty feet or so,—but the weight of their wood to the cubic foot is forty to fifty pounds. Many decaying logs of yellow birch and pine stumps were scattered along the brook bed. They were covered with beautiful mosses and fungi. The shelf-like growth, known as _Polypores_, was abundant on these trees. There are several varieties of this group of fungi here. The larger kind often attains a diameter from six inches to three or four feet, in a semicircle, according to age. It is a hard, leathery or cork-like growth full of pores, the top of the shelf seeming like a slanting roof, grained and striated as it were, with colored slates of gray and brown. This fungus seeks no special species of decayed tree, as I find it clinging to several,—the yellow and white birch, and hemlock logs and stumps. [Illustration: =The Rattlesnake Plantain.= (_Peramium._) =A group of three species collected on Rattlesnake Ledge, Mount Œta, Pownal, Vermont.=]