Meanwhile the Mongolia was pushing forward rapidly; on the 13th, Mocha, surrounded by its ruined walls whereon date-trees were growing, was sighted, and on the mountains beyond were espied vast coffee-fields. Passepartout was ravished to behold this celebrated place, and thought that, with its circular walls and dismantled fort, it looked like an immense coffee-cup and saucer. The following night they passed through the Strait of Bab-el-Mandeb, which means in Arabic The Bridge of Tears, and the next day they put in at Steamer Point, north-west of Aden harbour, to take in coal. This matter of fuelling steamers is a serious one at such distances from the coal-mines; it costs the Peninsular Company some eight hundred thousand pounds a year. In these distant seas, coal is worth three or four pounds sterling a ton. 
The Mongolia had still sixteen hundred and fifty miles to traverse before reaching Bombay, and was obliged to remain four hours at Steamer Point to coal up. But this delay, as it was foreseen, did not affect Phileas Fogg's programme; besides, the Mongolia, instead of reaching Aden on the morning of the 15th, when she was due, arrived there on the evening of the 14th, a gain of fifteen hours. 
Mr. Fogg and his servant went ashore at Aden to have the passport again visaed; Fix, unobserved, followed them. The visa procured, Mr. Fogg returned on board to resume his former habits; while Passepartout, according to custom, sauntered about among the mixed population of Somanlis, Banyans, Parsees, Jews, Arabs, and Europeans who comprise the twenty-five thousand inhabitants of Aden. He gazed with wonder upon the fortifications which make this place the Gibraltar of the Indian Ocean, and the vast cisterns where the English engineers were still at work, two thousand years after the engineers of Solomon. 