He had been
working for some time when he looked up.
"Ever hear of Dr. Edward Reichert of the University of
Pennsylvania and his wonderful discoveries of how blood crystals
vary in different species?" he asked.
I had not, but did not admit it.
"Well," he went on, "there is a blood test so delicate that one
might almost say that he could identify a criminal by the finger
prints, so to speak, of his blood crystals. The hemoglobin or red
coloring matter forms crystals and the variations of these
crystals both in form and molecular construction are such that
they set apart every species of animal from every other, and even
the races of men--perhaps may even set apart individuals. Here,
Walter, we have sample of human blood crystals."
I looked through the microscope as he directed. There I could see
the crystals sharply defined.
"And here," he added, "are the crystals of the blood on Elaine's
handkerchief."
I looked again as he changed the slides. There was a marked
difference and I looked up at him quickly.
"It is dog's blood--not human blood," he said simply.
I looked again at the two sets of slides. There could be no doubt
that there was a plain difference.
"Wonderful!" I exclaimed.
"Yes--wonderful," he agreed, "but what's the game back of all
this--that's the main question now.
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