Page:Transactions of the Natural History Society of Northumberland, Durham, and Newcastle-upon-Tyne (1867).djvu/109

Rh wall. These are situated in the very heart of the heathery treeless moor, at an elevation above sea-level of from 200 to 250 yards. Greenley Lough is about three-quarters of a mile longby a quarter broad, Little Cow Lough half a mile long, and Broomley Lough broader and shorter. At Tecket, at the head of a fine wooded dene which extends down to Simonburn, this same stream forms a waterfall, spreading out first for 30 or 40 yards over a channel of hard rock, overhung by ash and elm, with woodruff, sanicle, and oak-fern, and cool bright mosses, such as Milium hornum, Dicranum pellucidum, and Hypnum rivulare in the crevices, and then leaping over a crag some 20 or 30 feet in height amongst tumbled boulders. In the dene below the fall grow Rubus saxatilis, Agrimonia odorata, Carduus heterophyllus, Vicia sylvatica, Crepis succisaefolia, and Hieracium prenanthoides, and soon the stream totally disappears from its rocky channel only to reappear more than a mile lower down. In the lower part of the dale we trace the influence of the drier rocks in the appearance or increased abundance of such plants as Knautia, Scabiosa columbaria, Betony, Thymus, Galium mollugo, Silene inflata, Poterium sanguisorba, Agrimony, Campanula glomerata, Origanum vulgare, Arabis hirsuta, and Geranium lucidum. Warden Hill, crested with firwoods, rises to a height of 450 feet above Chollerford, standing out boldly into the angle between the North and South Tyne, and commanding an extensive view in every direction.