This experimental study was based upon*Presented beflore the American Physiological 1. Kety, S. S., Am. J. M . Sc., 1948, v215, 352. the recent work of Kety(1,2,3) and Elkin et society, April 21, 1950. 2 . Kety, S. S., Am. H t . J., 1949, v38, 321.
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