"Whilst the two plates were drying the photographer and I made an
enlargement from the negative I had taken by daylight. Then we did the
same with the two that I had just developed, washing them as quickly as
possible, for I was not troubling about the permanency of the prints, and
drying them with spirits.

"When this was done I took them to the window and made a thorough
examination, commencing with the one that appeared to show shadowy
daggers in several places. Yet, though it was now enlarged, I was still
unable to feel convinced that the marks truly represented anything
abnormal; and because of this, I put it on one side, determined not to
let my imagination play too large a part in constructing weapons out of
the indefinite outlines.

"I took up the two other enlargements, both of the chancel, as you will
remember, and commenced to compare them. For some minutes I examined them
without being able to distinguish any difference in the scene they
portrayed, and then abruptly, I saw something in which they varied. In
the second enlargement--the one made from the flashlight negative--the
dagger was not in its sheath. Yet, I had felt sure it was there but a few
minutes before I took the photograph.

"After this discovery I began to compare the two enlargements in a very
different manner from my previous scrutiny. I borrowed a pair of calipers
from the photographer and with these I carried out a most methodical and
exact comparison of the details shown in the two photographs.

"Suddenly I came upon something that set me all tingling with excitement.
I threw the calipers down, paid the photographer, and walked out through