shake my evidence, and doubtless impressed by my vehemence, they turned
round completely to return to the attack.

"Well, granted, as you say, that the church was taken first, the second
half of the film was exposed in Germany. But you, seeing the danger of
your position upon arrest, contrived to ruin these last three pictures
before the camera was taken away from you," snapped the Chairman.

In spite of myself I laughed.

"The second half of the film has never been exposed at all," I rejoined.

"How can you prove that?"

"Very easily. If I had ruined it by exposing it to the light as you
suggest, _the film upon development would have come out black! But it is
quite transparent!_" I replied in triumph.

My retort floored the Court. We were dipping into matters about which
they were completely ignorant. There was a hurried whispering and then
the Chairman commented:

"We'll soon prove that you are wrong!"

Proceedings were suspended. A clerk left the room to return a little
later with a civilian who proved to be a photographer in Wesel.

The problem was presented to him, but I saw at once that he knew nothing
whatever about the chemistry of photography. He was turned over to me
for cross-examination, and within three minutes I had so pulverised his