Patron cleared his throat, adjusted his spectacles, and prepared for a long historical lecture. "In common with certain Asiatic nations," said he, "the ancient Peruvians practised the barbarous custom of immolating victims at the obsequies of great men. Sometimes--according to Prescott--a thousand attendants and favourite concubines would be slaughtered, so that they might accompany the dead Inca to his bright mansion in the sun. On occasions, however, the actual slaughter was dispensed with, and images of clay in the form of mummies, such as we see here," said the savant, pointing to the blue figure, "were substituted for human beings. For every counsellor, or slave, or wife, or attendant, a clay image was placed in the sepulchre of the dead; so that, in such instance, there would be many hundreds of these fictitious mummies arranged round the corpse. The figure we have here is an example of a tomb image. I hope I make myself clear?"

"Perfectly," rejoined Darrel, slipping the image into his pocket. "But your lecture does not help me in the least."

"In what way? Where did you get the mummy?" questioned Patron disconnectedly.

"Out of a murdered woman's pocket."

"Bless me! how strange! Why was she murdered? And how did she become possessed of so unique a curiosity as a Peruvian tomb-image?

"Patron, my friend, those are two questions to which I am trying to obtain an answer."

"If I can help you, Darrel----"

"Thank you; Patron; but I fear you can help me no further. Good-day."

"Good-day, good-day," replied the Egyptologist hastily; for his mind was already reverting to his own particular work, and he was becoming oblivious to the story told by his visitor. "Good-day;" after which he soared into cloudland.

Darrel went away little satisfied with his visit. He had obtained certain historical information, but none likely to throw any light on the mystery of the double crime. The Blue Mummy was connected with the murders in some concealed way, independent of its archæological merits; and it was this hidden connection which Darrel desired to discover. At present, however, he could not see the slightest chance of gaining the necessary information; therefore, this especial clue was absolutely useless--at all events for the time being. Later on its value might be discovered and utilised; but in the meantime, Frank dismissed it, to follow up the clue of the initials on the linen of the dead man. To accomplish this he drove directly to Bond-street.