At State College, Pa., Pennsylvania State College scientists last week decided to operate on a cow. Into the stomach of this cow a hole would be cut for the insertion of a rubber tube to facilitate investigations interrupted last fortnight by the death of Cow Jessie.
In 1925, Vitamin B was found in Jessie's milk after Vitamin B had been deleted from her diet. Puzzled, experimenters cut a hole in Jessie's side, inserted a rubber tube, periodically examined the contents of her stomach. Ninety per cent of the bacteria in rumen were...
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