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"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.
And yet minute as these crystals are, this discovery is of immense medico-legal importance. Crime may now be traced by blood-crystals." He displayed on his table a number of enlarged micro-photographs. Some were labelled, "Characteristic crystals of white man's blood"; others "Crystallisation of negro blood"; still others, "Blood-crystals of the cat."
Reichert and Professor Brown of the University of Pennsylvania have made some wonderful discoveries. "We could distinguish human from animal blood before, it is true. But the discovery of these two scientists takes us much further. By means of blood-crystals we can distinguish the blood of man from that of the animals and in addition that of white men from that of negroes and other races.
He picked up a bottle of something with a faint greenish tinge. "See the bands gradually fade?" I watched, and indeed they did diminish in intensity and finally disappear, leaving an uninterrupted and brilliant spectrum. "My spectroscope," he said, simply, "shows that the blood-crystals of Barnes are colorless. Barnes was poisoned by some gas, I think.
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