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."

The highly distinguished M. Ferdinand de Lesseps, when en route
to Paris, kindly took charge of some cases of specimens for
analysis. But the poorest stuff had been supplied to him by M.
Marie; and the results, of which I never heard, were probably
nil. The samples brought to England, by order of his Highness the
Khediv, were carefully assayed. The largest collection was
submitted to Dr. John Percy, F.R.S. Smaller items were sent to
the well-known houses, Messrs. Johnston and Matthey, of Hatton
Garden, and Messrs. Edgar Jackson and Co., Associates of the
Royal School of Mines (fourteen samples). Finally, special
observations were made by Mr. John L. Jenken, of Carrington,
through Mr. J. H. Murchison, of "British Lead Mines," etc., etc.,
etc.; by Lieut.-Colonel Ross, the distinguished author of
"Pyrology;" and by Lieut.-Colonel Bolton, who kindly compared the
rocks with those in his cabinet. M. Gastinel-Bey's analysis of
the specimens brought home by the first Expedition will be found
at the end of Chap. VIII.