lviI vi its black lumps are made rod with the "od of the mangled miner. A blast might >ea communication with some vast reservoir water, and the narrow drifts and galleries 1 so fast that escape would become Uapossi '■■ Sometimes the gas—tho same gas that, uned and civilized, light- onr houses—accu olatea here his natural savage strength, id gathering too rapidly for the ventilator » purify, ssqaledjes with a force compared tth which ntapowder is a trifle. Every ungbi and splintered by its fury. hen fellows the "black damp"—air from bieh all the life-sustaining principle is burnt ft and if any escape unhurt from the con