1922. ] ‘' Renal Portal’ System. 161 
maximum—in other ee e fluid supplied by the rena! arteries has 
penetrated —_ densa empty channels of the ‘‘renal portal’? system as 
much as it ever will do, and therefore, in these three periods, the post- 
caval flow neneets the full outflow from the renal arteries, no flui 
iti retained in order to fill out further the empty renal venous mesh- 
Now the ti flows of the two ee = isin Peli phase are :— 
average aortic low=175 
rage post-caval foe c. a in 15 ilies 
and of te Aieadt pha 
verage a ithe. flow=173 c.c. in 15 minutes 
average post-caval flow=32 c.c in 15 minutes 
from which we may conclude (1) that of the 134 c.c. which escape via the 
post caval oa the first phase, approximately 32 c.c. are supplied by the. 
renal arteries, and the remainder, viz. 102 c.c t B 
w 
* es 
renal arteries, ie. the venous supply to the frog kidney is 8 approximately 
3°2 times as great as the arterial supply ; (2) that the flow in the aorta is 
To2x 1/2 ? the flow in each ra.v. ; (3) that the- 
flow in the renal arteries is approximately Ge) 1/5 of the total flow in the- 
approximately 3°4 times ( 
aorta ; and (4) that the flow in the cetectar abdominal vein is approxi-. 
mately 3 times that in each r.a.v. 
I performed ge other experiments similar to the above which, to 
CEE as space, I will ne record in detail. These only differed in the 
bore of the aan ha used, in human urine being added to the perfusing 
zip or Be the heart being cut ou oe 
mpa one < the results of these five experiments, I found that, 
viiaetts the volume of the v Spas: “sapply to the kidney relative to ‘the 
volume of the arterial supply, Experiment | Oe the former r as 3 
times Fiend ae the latter, and in the other fou 5 times, 
3 tim times, and 5 times respectively from which we may c conclude 
that the —— supply to the frog’s kidney is normally at least 3 times as- 
great as the tal a 
regards the volume of flow in the dorsal aorta Telative to _the 

tion ir the conduct of perfusion experim ts—Experiment | gave re 
former as being 3°4 times as great as the sabia, and the mor four expe- 

1/3, to wioovie the a of excess of pressure, 
ceca . /4 of 4 the rate ne flow in the aorta. 
m the results of three of the experiments we may also state tha 
1/5-1/6 of the total blood in the aorta is passed through the kidneys (the 
_ of Exp. 3 in this connection was unreliable and the value of 1/10- 
of Exp. 5 is —- aberrant to be considered). 
Finally t sins petaalon experiments (excluding ae A a res- 
vectively that the flow in the anterior abdominal vein is Bl’ 38° 63” and 
0-9 1°8 1-4 1-4 
ea times that in each of the renal afferent veins, or oe 7 and ee 
There is thus ue asege great variation in the volume of fluid passing 
through the an abdominal vein vaste to that passing through. 
