In the Swamp of Rattlesnake Brook may be found the Pitch or Torch-Pine (_Pinus rigida_), shad-bushes, white and black birches, chestnuts, high huckleberries, and small bushes of the Ague Tree (_Sassafras_), which seem rare here, but are abundant in southern New York. The odd spires of the double or black spruce are also found among the denizens of this region. From May until late November the swamp brings forth, in their season, arbutus, mountain snowberry vines, St. John’s wort, low huckleberry, the evergreen leaves of _Gaultheria_, prince’s pine, creeping evergreens, numerous rushes and sedges. Here, too, the goldthread entangles the roots of mosses and trilliums, while the Sundew (_Drosera rotundifolia_), creeps along the mossy sides of the wood road, and in the deeper sphagnum about the stream. The rare Large Whorled Pogonia (_Pogonia verticillata_), of the Orchid Family, has been collected in this swamp for three seasons. This orchid is rare in New England, save in Massachusetts and Connecticut. It was first found in Vermont near High Bridge and Colchester by Messrs. Robbins and Oakes, the pioneer botanists, who passed through the State in 1829. The delicate emerald green leaves of Clintonia, marsh marigolds, Solomon’s seal, Shin-Leaf (_Pyrola rotundifolia_), liverwort, wild briar-roses, lambkill, blue lobelias, Labrador tea, yellow loosestrife, blue-fringed gentians, innumerable ferns, the spikes of the Tall-Green Orchis, plants of the Round-Leaved Orchis, the Pink Moccasin-Flower, and rarely the beautiful orchid, _Arethusa bulbosa_—all of these conspire to make the region a wilderness of beauty. On an excursion to Thompson’s Brook, June 19th, near Meyers’s Sugar-Bush, I collected ferns and iris. As I descended to the hemlocks, near the waterfalls, I stumbled upon the late plants of the Showy Orchis (_Orchis spectabilis_), in bloom—which were fully two weeks past the regular flowering date. They had faded in the hills of Mosholu on May 19th.