1922.] * Renal Portal’’ System. 169 
Y 
The preceding data show (1) that the higher the osmotic pressure of 
the renal afferent vein fluid the greater the relative and absolute flow o 
; : 2 
flow from 3 n thirty minutes toe sti in She same time (!), 
hough the rates of owt in the r.a.v. remained unchan ged. 
EXPERIMENT 4. In this 0 cae *¢ 6% saline with 30 c.c. human 
urine added to each 2000 was throughout perfused through 
the aorta and I snuneasively gr ert pure 0°6%, 0°7% and 0°8% 
(Vs wo 
saline through the r.a.v., the two bottles remaining at 
say, with saline only in he cnrsraptc id 
uri as very small 208 the supply soon cease 
0°6% saline in the r.a, ut was cena plage with the 0° 7% 
and 0°8% hief purpose iment is 
earner the acceleration of flow r the sisectat fluid caus 
ie e high osmotic pressures of the 0:7% and 0:8% ais 
0-6% 0 Ok ak 15 —-11°0-11-20 (20 m. 
‘2 c.c. urine. gies Sngigoeee 148 c.c. series 888 c.c.in 120 m. 
(90 minutes) Il. 40 c.c. x6=240 c.c. 
ee pee 62 ¢.c, x 6=372 «.c.) 
=2°9 - ows. 
at ee Sed 11-20- 1-2 0 (120 m.) 
cir — perfused 709 G.c. 
ab ciiains ie ANi 4; 39 c.c. 
ae Pe 314 c.c. 
path | flows 
0°7% “ 30-1°45 
1 drop urine 
(15 m.) 
Page 1-50-2°50 (60 m.) 
cir. 0°2 aorta rasa oo et Do in 120 m. 
urine (60 ta,) Ls TOs, 132 c.c. x 2=264¢ 
. r.8.¥. si 160 c.c. x 2=320c. re ) 
0.8% tog es 3-20-3°50 (30 m.) 
cir. warte peetasid: 279 c.c. (x4= a in 120 m. 
rine 180 a} = — er Flee x4= 
i 69 ¢.c. x4=276 0.0.) 
89: 1 flows. 

res given (483. 556, 570) represent the rate of out flow from 
the wane ia pated Tato is: ih the increased rates of flow occur through the 
renal arteries fapesd (see Exper. 3) and the effect of the raised osmotic pres- 
sure in the r.a.v. fluid is to be Farge not only by the increases shown 
by these figures but also by the absence of decrease of aortic flow which 
occurs in rsapinnieke in which the perfusing fluid remains constant in 
quality. 
