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That has long been
known, but working on this fact Dr. 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. It is often the only way of
differentiating between various kinds of blood.
"The variations in crystals in the blood are in part of form and
in part of molecular structure, the latter being discovered only
by means of the polarising microscope. A blood-crystal is only one
two-thousand-two-hundred-and-fiftieth of an inch in length and one
nine-thousandth of an inch in breadth. 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.


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