What is your opinion about Cross's Headache Cure? Would you
recommend it for a nervous headache?

BURGESS THURSTON,
c/o Mrs. S. BONCOUR.


Craig held up the writing so that we could all see that he had
written what Dixon declared Thurston wrote in the note that had
disappeared. Then he dipped another pen into a second bottle, and
for some time he scrawled on another sheet of paper. He held it up,
but it was still perfectly blank.

"Now," he added, "I am going to give a little demonstration which
I expect to be successful only in a measure. Here in the open
sunshine by this window I am going to place these two sheets of
paper side by side. It will take longer than I care to wait to make
my demonstration complete, but I can do enough to convince you."

For a quarter of an hour we sat in silence, wondering what he would
do next. At last he beckoned us over to the window. As we
approached he said, "On sheet number one I have written with
quinoline; on sheet number two I wrote with a solution of nitrate of
silver."

We bent over. The writing signed "Thurston" on sheet number one
was faint, almost imperceptible, but on paper number two, in black
letters, appeared what Kennedy had written: " Dear Harris: Since
we agreed to disagree we have at least been good friends."