Se 
1922.] ‘© Renal Portal’ System. 191 
Thus the left kidney urine in fete parts of the 
experiment was stronger in trogen than the 
right kidney urine, but the air urine strengths 
were more nearly equal towards the end of the 
experiment. 
EXPERIMENT 2. Mole rabbit. The experiment was similar to the 
set going at 1°40 and put tubes from 2-17-3°30. 
Artery 
perfusion IL =7°9c.c. (73 m.) [1 e.c. = DCIL] 
in both IR = 1°3 c.c. (73 m.) [1 ¢.c. = DCIR] 
kidneys. 
(Soca oft be: Ae on perfused 135 c.c. = 112 ¢.c. per 
At 3 301 a wea the current in the right kidney. 
Artery 
perfusion 3°55-4-10, 35 c.c. perfused = a > : c. per 5 minutes ; 
in left (41 c. per 5 minutes, 4 
kidney ; so the rate of perfusion in iy poe p part of aa 
venous [22 the rte was about the same asin the first part. 
pestusion Between 4°17 and 4°45 I had collected 
in right 
kidney. 
from the left kidney 1-5 c.c. (28 m_.) [1 ¢.c. = DCIIL} 
from the right kidney 8.5 c’c.(28 m.) [l c.c. = RCIIR} 
Thus the eh sie di current in the right kidney pro- 
ie ae in the second part of the fhe ase 5-6 
ie nica as the direct current in the 
left kidney, hough in the first cre of the experi- 
ment t t kidney ex anew over 6 times as 
much settee as the right kidne 
Der. = 0°000186 gm. Nitrogen. 
gm. 
DCIIL = 0:000226 a = 
RCIIR = 0:000186 gm ‘i 
1 c.c. perfusing fluid = 0000213 gm. 
Thus the reverse current urine is not much weaker 
than the direct current urine. 
I performed eee other experiments similar to the above and with 
similar results. In one of them the urines of both kidneys with arterial 
perfusion n were exac ratte ss: in strength ‘ 000320 gm.) and nearly equal 
~ pethenss A ene cx 3. 75 ¢.c.;: DCIR = 3°9 c.c.) but ae gee was as us 
es it artry-perfased soon All someralar ce capillaries contain dye 
ye 
no trace of capsules. Large space 
rior inner and outer capsule walls. Dye 
here and there in intertubular capi in 
lumina of col and convoluted tubules. 
Lumina of tubules very wide. In certain small 
