Six soft-eyed young rabbits, all dark grey, hopped nonchalantly about their pen in Harvard's Laboratory of General Physiology last week as many a biologist discussed their twisted pedigree. They were living evidence of what two experimenters had reported as "the first certain demonstration that mammalian eggs can be fertilized in vitro."

In vitro (in glass ) is the polite name for methods by which physiologists impolitely try to fertilize ova removed from a female with sperm removed from a male. Such experiments have long been successful with forms of life lower than mammals. But attempts at external fertilization of rabbit eggs,...

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