One of the samples of petroleum I show came from No. 5, or Sandhole Pit, at Broxburn. It oozed from sedimentary strata, which had no sill near, at a position 10 fathoms under the Dunnet seam. It was gathered a few barrels at a time, for a year or more, until several hundred barrels were obtained. The crude oil contained too much solid paraffin to flow freely to the well. It was associated with brine of specific gravity 1·095, denser than ordinary sea-water. I consider that this petroleum has been produced where it is found at temperatures far under ordinary destructive distillation temperature, and comparable with the petroleums of America, Russia, and elsewhere. The other sample is from the Dunnet Mine, and is from cavities in the dolerite sill. The mine proceeds from Albyn Crude Works, cutting through the strata at an angle, and going towards East Mains Farmhouse. It begins at a position just under the Broxburn seam, and ends 4 fathoms below the Dunnet seam. At 8 feet under the Dunnet, there is a thin shale about a foot thick, and 6 feet under it comes the dolerite sill, the thickness of which here is unknown. In this sill there are cavities filled, sometimes with fluid petroleum, sometimes with brown solid bitumen, sometimes with semi-solid. The thin seam which lies 6 feet above the sill is destroyed by the heat, and no doubt these cavities are filled with the products of distillation of this, shale. The Dunnet shale,