1922.] ‘* Renal Portal’’ System. 163 
(a little extra salt being added to make the osmotic pressure of 
this fluid approximately equal to that of the 46 fluid, and, _ 
the 46 fluid, stronger than that of the aortic perfusion fluid !), 
Bins oe this the 30 fluid. Tn = experiments I always endea- 
collect at least 1 c.c. of each sample of urine for 
nitrogen oe sites estim ones ion 
Two r.a.v. bottles at 6c ure. Experiment set going at 
8° 50, the mt es i "ihe en r.a.v. in the first phase of 
Fey Beebe aol rot ‘collecting tubes from 9-0-9 30. 
First left (IL) tube contained 1°6 c.c. urine. Not 
Phase: 9-0-9:30 va estimated 
30 fluid Ist right (IR), +3 a 1°65 ,, [N.E.] 
in 
oe 2nd pair tubes from 9: 30-10-15 (by which time the 
ment was in good working order 
(I eet or2 5 minutes) = ‘* 30 e.” 
Aorta perfused 571 c.c. 
Balan a r.a.V pases 137 c.c. ¢ = 4°5: 1 flows. 
ht r 
1l5c 
T then cae the aibbet tubes of ‘the two r.a.v. cannulae, 
siphoned off most of the 30 fluid contents of the two r.a.v. 
rubber tubes, was perfusing on ‘as wo r.a.v. by 
Put 3ed at tubes from 10°30-1 
Second 
ase: IIIL + I1IR = 2°95 c.c. [N.E.] 
46 fluid 
in r.a.v. Soe 4th Essai a from 11:0-11 45 
VL+1VR= = ‘* 46 urine. 
Aorta “perused 497 c, 
110-1145 L.r 135 wilde 1 flows. 
R.f ra Ys (j bi 115¢.c. 
ro stopped 
oe ne SE aod 0: ener - Nitrogen. 
i c.c a 0:000160 g os 
lL ¢.c. a fluid = 0:000133 gm. na 
loc. 4 ,, x 0:000200 gm. oe 
Tn this ex pelment therefore, the 30 urine and 46 urine samples were 
pe in acne strength. The decrease in output of urine during 
e peri of 30 minutes each during the course of the eepevinient 
is mocewentie 3°25 ¢.c., S4¢¢ 95 c.c., and 19 c.e 
seven other experiments similar to this and obtain 
performed wit — — re en in which with 40 fluid (i.e. 0°6% saline 
r 
+40 cc. rine 
successively filled is aires ~ pattle with the e same solution, with 50 fluid 
and with 61 fluid, and obtained samples of urine of increasing nitrogen 

riments in which the r 30 perfusion fluid was not made 
eadtedty stronger than the aortic “quid (by the addition of sodium 
egies e) the 46 urine (i.e. the u uced du perfusion with the 
id) er ae to a4 appreciably stronger in nitrogen than the 30 
253 gm 000186 compared w 
oie ie. g. 0 ith 0-000173 gm. 
and 0-000133 ere jenpentive el te This is but one of several of the various 
ist between the renal 
osmvtie pressure relationahipe which I found to ex 
meshwork and the intertubular plexus. L hope to publish an 
pa 
venous 
account of these in a wbenyeent 
