A surgeon, about to make a transfusion, scientifically matches a donor's blood to his patient's to such purpose that no shock results. In like manner Congress has ordained that Immigration shall be scientifically matched to the U. S. racial bloodstream.
It is far simpler, however, to match up the blood of individuals than the many mixed bloods of a populous nation. In attempting to execute the orders of Congress, a large corps of census experts, statisticians and genealogists have wrestled for four years with the problem of tracing back for 140 years the ancestry of 120,000 people. The chief results so...
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