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"Let us go back to the very start of the case," began Kennedy when
we had all assembled, "the murder of the chef, Sam."
It seemed that the mere sound of his voice electrified his little
audience. I fancied a shudder passed over the slight form of Mrs.
Pitts, as she must have realised that this was the point where
Kennedy had left off, in his questioning her the night before.
"There is," he went on slowly, "a blood test so delicate that one
might almost say that he could identify a criminal by his very
blood-crystals--the fingerprints, so to speak, of his blood. It
was by means of these 'hemoglobin clues,' if I may call them so,
that I was able to get on the right trail. For the fact is that a
man's blood is not like that of any other living creature. Blood
of different men, of men and women differ. I believe that in time
we shall be able to refine this test to tell the exact individual,
too.
"What is this principle? It is that the hemoglobin or red
colouring-matter of the blood forms crystals.


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