A hitherto unknown dietary factor essential for reproduction in rats has been discovered by Dr. Herbert M. Evans and Dr. Katharine S. Bishop, of the University of California.* They call it ";Vitamin X." "Vitamins," now so popular, were unknown ten years ago. They have not been isolated. They cannot be seen or weighed. They came to light only when it was found that diets apparently perfectly balanced according to pre-existent information did not provide proper nourishment in some cases arid even brought on certain ";...
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