The tons of specimens brought to Cairo were, I have said, publicly exhibited there, and created much interest. But the discovery of a mining-country, some three hundred miles long, once immensely wealthy, and ready to become wealthy once more, is not likely to be accepted by every one. Jealous and obstructive officials "did not think much of it." Rivals opposed it with even less ceremony. A mild "ring" in Egypt attempted in vain to run the Hamamat and Dar-For mines (Chap. III.) against Midian. Consequently the local Press was dosed with rumours, which, retailed by the home papers, made the latter rife in contradictory reports. To quote one case only. The turquoise-gangue from Ziba (Chap. XII.) was pronounced, by the inexpert mineralogists at the Citadel, Cairo, who attempted criticism, to be carbonate of copper, because rich silicates of that metal were shown at the Exposition. No one seemed to know that the fine turquoises of Midian have been sold for years at Suez, and even at Cairo. There was, indeed, much to criticise in the collection, which had been made with a marvellous carelessness. But we must not be hard upon M. Marie. He is an engineer, utterly ignorant of mineralogy and of assaying: he was told off to do the duty, and he did it as well as he could--in other words, very badly. He neglected to search for alluvial gold in the sands. Every Wady which cuts, at right angles, the metalliferous maritime chains, should have been carefully prospected; these sandy and quartzose beds are natural conduits and sluice-boxes. But the search for "tailings" is completely different from that of gold-veins, and requires especial practice. The process, indeed, may be called purely empirical. It is not taught in Jermyn Street, nor by the Ecole des Mines. In this matter theory must bow to "rule of thumb:" the caprices of alluvium are various and curious enough to baffle every attempt at scientific induction. Thus the "habits" of the metal, so to speak, must be studied by experiment with patient labour, the most accomplished mineralogist may pass over rich alluvium without recognizing its presence, where the rude prospector of California and Australia will find an abundance of stream-gold. Evidently the proportion of "tailings" must carefully be laid down before companies are justified in undertaking the expensive operation of quartz-crushing. Hence M. Tiburce Morisot, a practical digger from South Africa, introduced at Cairo by his compatriot, M. Marie, to my friend M. Yacoub Artin Bey, found a fair opportunity of proposing to his Highness the Khediv (October, 1878) a third Expedition in search of sand-gold. The Viceroy, however, true to his undertaking, refused to sanction any "interloping."