in my practice as "medicine man" frequently sent him notes for the medicines I required, and not knowing the Arabic terms, I used the Latin names for such drugs as I was acquainted with. From this, Zecki must have come to the conclusion that I was a qualified chemist, and as at that time his assistant, Said Abdel Wohatt was, and had been for some time, trying to extract saltpetre in Khartoum and the neighbourhood, Zecki questioned me as to its production in Europe, but I had to admit that I had only seen the crystals obtained in the laboratory when at the University, and had no experience of their production on a commercial scale. I told Zecki what little I knew of testing the crystals, and you may imagine my surprise when three days later I was summoned before Yacoub to explain the manufacture of saltpetre.
The new Amin Beit-el-Mal — El Nur El Garfawi — came to the Saier after sunset, and conducted me to Yacoub's house. One thinks rapidly under such circumstances, and by the time we reached Yacoub's house I had my tale thought out. I saw that if I declared that I could not do the work I should not be believed, and would be flogged and have extra irons placed on me for contumacy. To lead them on to believe that I could manufacture saltpetre meant my release from prison. After a long discussion with Yacoub, it was arranged that I was to construct three large tanks, about six feet long and four feet high, in which impregnated earth was to be mixed with water, and the solution drawn off and allowed to
