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232 But our experiments were destined never to be finished. About April, 1896, rumours first, and then precise news, reached Omdurman that the Government troops were again advancing. Then came the startling news that Dongola had been taken, only to be followed by the news of the capture of Abou Hamad. The fulminate factory presided over by Hassan Zecki had run short of ingredients, and as the stock of chlorate of potash ordered from Egypt had not arrived, it was believed that now the troops held all the country between Dongola and Abou Hamad, it would have no chance of getting through. Abdalla Rouchdi, the chemist of the Beit-el-Mal, had, with Hassan Zecki, failed to produce chlorine, as had also others, therefore we were ordered to experiment at once. Nahoum was sent over to the Beit-el-Mal to collect all appliances, chemicals, and anything else he chose to lay his hands upon. Our establishment was growing, and Hamadan was delighted at having under his charge people who were to do so much for Mahdieh. But the chlorine required for the production of the chlorate of potash refused to appear. Our laboratory was a dangerous place to visit, for we had jar upon jar containing mixed acids, and explosions were the order of the day. Nahoum had a lively time, deaf as he was. Once, and once only, Hamadan made pretence of understanding our experiments; he took a good inhalation from a vessel which had in it a mixture of various acids with permanganate of potash. He was almost suffocated, but he was much impressed, and told the Khaleefa what devoted