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Rh hands. Do you hold the opinion that, provided Mr. Hereford had been able to obtain some previous knowledge of the arrangement of the box, it would have been impossible for him to provide himself with some memory system, or key, in letters or in figures, which would have enabled him to memorize the eighteen necessary manipulations?"

Du Brock and Lund waited inquiringly for McAdams to reply, but the detective only glared at them angrily.

"Also," Du Brock continued, when it became evident McAdams was not going to speak, "I personally would prefer not to forget that Mr. Hereford has at his command all the engines of modern business. There is, if I am not misinformed, cable communication with Java. Do you think it impossible for Mr. Hereford, if he doubted his