Knowing these facts, I wasted no time in soliciting government aid for my project, but was content to secure a permit to attempt the recovery with private funds, with which my uncle's fortune supplied me in abundance.
In April, 2151, I set up my laboratory on the edge of the area of death. I had never accepted the orthodox view as to the composition of the gas that issued from the Stassfurt mines. In a few months I was gratified to find my doubts confirmed. A short time after this I made a more unexpected and astonishing discovery. I found that this complex and hitherto misunderstood gas could, under the influence of certain high-frequency electrical discharges, be made to combine with explosive violence with the nitrogen of the atmosphere, leaving only a harmless residue. We wired the surrounding region for the electrical discharge and, with a vast explosion of weird purple flame, cleared the whole area of the century-old curse. Our laboratory was destroyed by the explosion. It was rebuilt nearer the mine shafts from which the gas still slowly issued. Again we set up our electrical machinery and dropped our cables into the shafts, this time clearing the air of the mines.
A hasty exploration revealed the fact that but a single shaft had remained intact. A third time we prepared our electrical machinery. We let down a cable and succeeded in getting but a faint reaction at the bottom of the shaft. After several repeated clearings we risked descent.
Upon arrival at the bottom we were surprised to find it free from water, save for a trickling stream. The second thing we discovered was a pile of huddled skeletons of the workmen who had perished over a century previous. But our third and most important discovery was a boring from which the poisonous gas was slowly issuing. It took but a few hours to provide an apparatus to fire this gas as fast as it issued, and the potash mines of Stassfurt were regained for the world.
My associates were for beginning mining operations at once, but I had been granted a twenty years' franchise on the output of these mines, and I was in no such haste. The boring from which this poisonous vapour issued was clearly man-made; moreover I alone knew the formula of that gas and had convinced myself once for all as to its man-made origin. I sent for microphones and with their aid speedily detected the sound of machinery in other workings beneath.