106 Journal of the Asiatic Society of Bengal. [N.S., XVIII, 
abnormal conditions however, whether of excessive flow in the 
plexus, the fluid in the renal afferent vein can and does 
influence the arterial fluid in the intertubular plexus, the 
amount and composition of the urine varying in consequence, 
but these abnormal conditions of course never occur in nature. 
The value of these experiments under abnormal conditions 
however is that they afford additional proof of the two pro- 
positions which it is the object of this memoir to substantiate, 
viz. the non-functional character of the so-called “ renal portal” 
system (and therefore the separateness of the renal venous 
the whole of the urine by the urinary tubules, the glomeruli 
taking no direct part (a subject which I shall discuss more 
fully in Part IV). 

I should like here to express my indebtedness to the late 
Professor E. G. Hill, D.Sc., Principal of the Muir Central 
College, Allahabad, for his very kind assistance in connection 
with chemical work. Though in failing health at the time he 
Sircar, I should have been severely handicapped in my 
ies. I also wish to offer my sincere thanks to Sir 
Arthur Keith, F.R.S., for very kindly sending me a full 
abstract of the paper by Gurwitsch (discussed in Part III) and 
for aiding me in other ways, and to Professor W. M. Bayliss, 
F.R.S., for the large amount of time he has generously devoted 
to reading through the manuscript and supplying advice and 
criticism. [ also wish to thank Professor E. H. Starling, 
»R.S., and Professor J. P. Hill, F.R.S., for similar assistance 
kindly given. Professor R. Moody, M.A., has also kindly aided 
me in connection with certain calculations. Finally, 1 wish to 
express my great indebtedness to Dr. 8. W. Kemp for his 
assistance in the publication of this memoir. 
PART. IL. 
KIDNEY SECRETION WITH AND WITHOUT THE RENAL 
AFFERENT VEIN SupPLy in Livine ToaDs AND Frogs, AND 
IN PERFUSION EXPERIMENTS 
the 
meshwork) in the substance of the «« portal” kidney is distinct 
and separate from the true capillarization of the efferent glome- 
rular arteries round the tubules—the intertubutar plexus—, save 
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