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It has been demonstrated by direct measurements of the blood-flow 1 that the kidneys receive a very effective vaso-motor supply by way of the greater splanchnics. The question whether the blood-vessels of these organs are also innervated by the vagus nerve remains, however, still rather unsettled, in spite of the fact that several investigations pertaining to it have been made. Thus Cohn-heim and Roy 2 concluded upon the basis of oneometric determina-tions that the nerves just mentioned are devoid of vaso-motor fibers for this particular circuit. The problem was again dealt with pleth-ysmographically by Bradford 3 and Walravens. 4 These authors also deny the existence of such fibers within the vagal pathway. Masius, 5 on the other hand, holds that fibers of this type are present, because when chloral or atropin are injected, the stimulation of the peripheral stump of the vagus does not produce an inhibition of the urinary secretion; and, furthermore, vaso-constric-tory influences cannot well be excluded, because the inhibition, whenever present, continued for a longer time than the fall in arterial blood-pressure. Arthaud and Butte 6 also observed, during the inhibition of urinary secretion, a decrease in the flow of blood from the opened renal vein. It happened at times that long-con-* Received for publication, December 7, 191o. 1 See preceding papers of this series in Arch. f. d.

THE BLOOD SUPPLY OF THE KIDNEY. V. THE INFLUENCE OF THE VAGUS NERVE UPON THE VASCULARITY OF THE LEFT ORGAN