I had heard of Wash-Tub Brook for years, and on July 5th started off to explore the valley and the cliffs of Gregor Rocks above North Pownal. A lime-rock ridge runs from the base of Mount Anthony southeasterly to the Glebe in Witch Hollow region. The soil of the latter is principally black slate, with outcropping boulders of marble and lime-rock. In 1899, Mr. W. W. Eggleston of Rutland had visited this valley, and reported the rare Rue-Wall Spleenwort and the Purple-stemmed Cliff-Brakes growing abundantly on Gregor Rocks. I followed his path of cliff-climbing, as nearly as possible. Now that the orchid season was practically ended, I was giving my attention to hunting ferns, and I knew I should find them among the lime-rock cliffs. I had recently collected the Walking Fern in its native haunts. I proceeded up the valley of Wash-Tub Brook, passing the limestone mills northward, toward Mount Anthony and Peckham’s Hollow. Another stream, known as Hemlock Brook, flows down from the eastern slopes of Perkins’ Hill, and joins the Wash-Tub stream near the lime crushers. All the streams in this western corner of Pownal flow to the Hoosac River, while the streams from the northern summits of the Dome and Mount Œta flow northward to the Walloomsac. [Illustration: =The Gregor Rocks, Hoosac Valley, from Pownal Centre, Vermont.=] For the greater part of the valley, Wash-Tub Brook flows through open pasture lands. The bed is broad and shallow, strewn with numerous small lime-rock boulders drifted down from the hills with the floods of spring. The larger boulders wear scars and dimpled erosions of the glacial period. I took time to explore the ledges above, where the depressions reveal the terraces of an ancient lake. The prevailing evergreen trees here appear to be hemlock and cedar—the American _Arbor Vitæ_—whose roots cling to the cliffs, their green spires lending a touch of coloring to the bare-faced walls.