Dr Fleming read a paper, entitled “Remarks on certain grooved surfaces of Rock in Arthur's Seat.” He referred, in the first instance, to the surface of the bed of porphyry, known as the Bog Crag, and contiguous to the Hunter's Bog; and shewed, from the directions of the markings being neither parallel to the valley, nor the neighbouring cliff, that they could not be the result of glacial, diluvial, or iceberg action, but were probably caused by the sliding of the contiguous beds at their upheaval; and this view he considered strengthened by the state of the detritus of the cliff of the Well Crag. He then took notice of a grooved surface of basalt, contiguous to a singular trough to the east of St Anthony's Well, but which might have been produced either by glacial or diluvial action.