Heart Radioaction

Fresh evidence suggesting that the beat of the heart is initiated by radioactive elements in the blood was reported by Professor Charles Christian Lieb of Columbia (pharmacologist) from the researches of Dr. Hendrik Zwaardemaker, professor emeritus of physiology at the University of Utrecht, Holland. Professor Zwaardemaker took the hearts out of eels and frogs, pumped through them physiological salt solutions. The hearts beat in vitro half an hour or so, then ceased. Professor Zwaardemaker added small amounts of potassium salt to his solution. The hearts began to beat again. They continued so for 24 hours. Potassium is weakly radioactive. Other radioactive elements gave the same stimulating results--radium, thorium, uranium, polonium.

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