50-50 Chance

It's a wise child that knows his own father, but henceforth the Rh* factor will make it easier to establish paternity. Brooklyn's famed Blood-Expert Alexander Wiener pointed out last week that there are eight Rh blood types (instead of two, as hitherto believed). The factors are inherited and can be used to prove whether a given man could possibly be a given child's father. The Rh factors raise possible blood-type combinations to 288, raise an innocent man's chances of proving non-paternity from one in three to 50-50.

*A mysterious blood element involved in the

deaths of thousands of newborn infants every

year (TIME, Nov. 27, 1944). The name Rh

comes from rhesus monkeys, in which it was first

discovered.

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