When
their witness to the past is supported by so many converging
lines of evidence it becomes irresistible. I will add only one
further testimony which has been brought into court in recent
years.
The blood consists of cells, or minute disk-shaped corpuscles,
floating in a watery fluid, or serum. It was found a few years
ago, in the course of certain experiments in mixing the blood of
animals, that the serum of one animal's blood sometimes destroyed
the cells of the other animal's blood, and at other times did
not. When the experiments were multiplied, it was found that the
amount of destructive action exercised by one specimen of blood
upon another depended on the nearness or remoteness of
relationship between the animals. If the two are closely related,
there is no disturbance when their blood is mixed; when they are
not closely related, the serum of one destroys the cells of the
other, and the intensity of the action is in proportion to their
remoteness from each other. Another and more elaborate form of
the experiment was devised, and the law was confirmed. On both
tests it was found by experiment that the blood of man and of the
anthropoid ape behaved in such a way as to prove that they were
closely related.
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