T HE effect of the dependent position upon blood flow to the extremities has long beed. a matter of controversy. Even when the limbs remain ill the plane of the body, and the whole is tilted foot-downward, there is little agreement concerning the changes in blood flow that take place in the limbs. Youmans, Akeroyd, and Frank in 19351 found a rapid decrease in the temperature of the skin of the toes and of the lower legs when subjects were changed from the horizontal to the erect posture. The