I may here mention that several narrow streaks of coal varying from an inch up to one of eight inches in thickness, discovered in the French shaft, have been found in the black shale. This coal partakes of the nature both of anthracitic and bituminous coal, the former quality predominating, but I may say, that even if it were found in quantity, it would only be suitable for specially constructed furnaces, as it is very refractory. No “structure” or organic remains have been discovered in any specimen of coal found in the reef of which I am aware, but many coal plants have been found in the reef itself, and specimens have been deposited in various museums. Some years ago the olive-colored shales of the reef at the southeast of the mine very frequently cracked, making great fissures at the surface. These often remained open for months and even years, until the whole mass of reef which was thus detached from the main body, gradually slid down to a solid bearing. In doing so, when the moving mass was heavy enough, the pressure upon the particles of rock within the fissure was so great that a fine, smooth and shiny face or a light gray color was made, entering many feet, with streaks or grooves running down, glistening and lustrous, the prismatic colors of which could then be seen for weeks together if viewed from a suitable position. When seen to advantage the sight was really charming, and could never be forgotten by those who had the good fortune to view it. But the first shower of rain would disintegrate the striated face of the rock, and by this means destroy the beautiful play of light described. In the drives and deep workings in the black shale the miners are troubled both with fire-damp and choke-damp, and many accidents, more or less serious, have occurred therefrom through their ignorance. The black shale is water bearing, and wells sunk in it to a depth of eighty feet or more yield in most cases a good supply. I have, I think, for the present done with the sedimentary formations, and come now to the igneous rocks below them. The first rock under the black shale gone through, as shown in the diagram, is a light gray volcanic rock, three feet thick, with a specific gravity of 2.815. The body of the rock is of a light bluish gray color, and contains beside other minerals nodules of quartz, agates and jasper, from the size of a mustard seed to that of a walnut. Next is found eight feet of a compact augitic or hornblendic rock, of a deeper gray color and very tough, then a seamy rock resembling basaltic trap, which was only worked to a depth of four feet in the shaft shown in the section, but is of unknown depth, for, since the Mining Board shaft was abandoned, others have been sunk, one by the French company, and another to a depth of 620 feet by the Central company, and they both are still in this same rock.