Mlle.—It is made of gold.

This last answer is based upon another code for the various metals, which may be something like this:—

Brass is represented by T
Copper„„C
Silver„„D
Gold„„H
Iron„„J
Tin„„M

Some person in the audience hands the Professor a silver cigarette case, and, looking up to the stage, he remarks—

“This is harder. Come, perfectly, now!” (c = b, p = o, now = x.)

“I see a box,” murmurs Mlle. C dreamily.

“Describe it.” (d = silver.)

“It is made of silver.”

“Do just have something further, if you please.” (d = c, j = i, h = g, s = r, f = e—making “cigre.”)

“It looks like a cigarette box—a cigarette case.”