Thoreau's Journal: 29-Aug-1858
Almost the very sands confess the ripening influence of the August sun, and me thinks, with the slender grasses waving over them, reflect a purple tinge. The empurpled sands. Such is the consequence of all this sunshine absorbed into the pores of plants and of the earth. All sap or blood is wine-colored. The very bare sands, methinks, yield a purple reflection. At last we have not only the purple sea, but the purple land.