Abstract
PROF. SWALE VINCENT, in his recently issued “Introduction to the Study of Secretion”, refers, in the chapter on kidney secretion, to my proof (Journ. and Proc. Asiatic Soc., Bengal, N.S., vol. xviii. pp. 85–193, 1922) that the network of renal afferent veins in the substance of the frog's kidney has nothing to do with renal secretion, and states that this discounts most or all of the evidence (Bainbridge and Beddard and others) hitherto advanced in support of the idea that the tubules secrete. I submit that this does not represent the position. I have shown in the paper above quoted that it is almost certain that the secretion obtained by Bainbridge and Beddard in the frog's kidney, when the arteries were ligatured, was due solely to venous blood percolating into the true capillaries surrounding the tubules, and this necessarily implies secretion by the tubules.
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