of 92%o of control values. All dogs survived the experiment without evidence of renal failure. A preliminary report of this work was presented at the Conference on the Microcirculation as related to Shock, Boston University, 30 March 1967. Received for publication 19 September 1967 and in revZised form 26 October 1967. It is concluded that hemorrhagic hypotension in dogs leads to a progressive ...