to a dark damp patch, I tasted the earth, and, believing saltpetre to be present, I mixed some of the earth with water, pouring off the solution into a small coffeepot, and setting it to boil. More solution was added as the water boiled away, and at the end of two hours I had a small deposit of a thin syrupy consistence; pouring this upon a burnt brick, the moisture was absorbed, leaving the crystals behind, and these on being placed on hot charcoal burned away. I next took some of the earth, dried it, and rubbing it fine, allowed it to fall in a thin stream on to the fire; the "sissing" and occasional coloured sparks convinced them that a valuable deposit had been discovered, and Hamad'na Allah was sent to Omdurman to inform the Khaleefa.
During his absence, the Fellati told Yacoub that the burning of the crystals was no proof that they were saltpetre; I was therefore told to produce a quantity to be submitted to Zecki and the Greek Perdikaki, the Khaleefa's gunpowder manufacturer. Hassan Zecki came to Halfeyeh to examine the crystals and declared them good; Perdikaki sent a Greek employed with him, but he not being able to give an opinion, took the crystals to Perdikaki, who sent me a message to the effect that they were useless, but that rather than I should be sent back to prison he would say they were good on condition I tried to produce further quantities in "needles," and not in grains. On Hassan Zecki presenting his report to the Khaleefa, and telling him that I should have some large pans sent out to me, he sent off
