"You are sure of it?"

"The presumption is strongly against it. Bodies in the
dissecting-rooms are injected with preservative fluid. These
ears bear no signs of this. They are fresh, too. They have been
cut off with a blunt instrument, which would hardly happen if a
student had done it. Again, carbolic or rectified spirits would
be the preservatives which would suggest themselves to the
medical mind, certainly not rough salt. I repeat that there is
no practical joke here, but that we are investigating a serious
crime."

A vague thrill ran through me as I listened to my companion's
words and saw the stern gravity which had hardened his features.
This brutal preliminary seemed to shadow forth some strange and
inexplicable horror in the background. Lestrade, however, shook
his head like a man who is only half convinced.

"There are objections to the joke theory, no doubt," said he,
"but there are much stronger reasons against the other. We know
that this woman has led a most quiet and respectable life at
Penge and here for the last twenty years. She has hardly been
away from her home for a day during that time. Why on earth,
then, should any criminal send her the proofs of his guilt,
especially as, unless she is a most consummate actress, she
understands quite as little of the matter as we do?"

"That is the problem which we have to solve," Holmes answered,
"and for my part I shall set about it by presuming that my
reasoning is correct, and that a double murder has been