Another Harvard man, Dr. Marcus Singer, professor of neuroanatomy at the Harvard Medical School, approached the growth problem from another angle: the nerves of amphibians. Newts and salamanders can grow new legs and tails with the greatest of ease. Tadpoles can do the trick too. But when they grow up to be frogs, their more complex bodies can no longer regenerate new members.
About six years ago, Dr. Singer was making experiments on the nervous systems of newts. His chief interest was the nerves themselves, but in the course of the experiments he found...
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