1922.] ‘“* Renal Portal’’ System. 173 
tied eect and Sree laterally by pads of putty, SO 
I 
ow. we 
heiaiianaiis hecnatecaged the post-caval in order to fill out the 
two r.a.v. anterior to the _ slips, i.e. to re- pea cape the 
rk. -By,41* 
former fluid Big marin in the renal venous meshwor 10 
the two r.a.v. looked n pete in size. I put second ae tubes 
120-115 “BO 
Shut. 11L + OR = = 2: 1 c.c. (30 m.) = shut vein urine (Ist sample) 
1 c.c. 
[11°20_-11 50 aorta oboe te 350 c.c. ]. 
Put third pair tubes fro 55—12°25. 
ITIL - a = 1°65 c.c¢: "(30 m.) = shut vein urine (2nd sample) 
[le 
{11 5-129 25 aorta Lachine? 279 c.c 
rogen Strengths. 
Of = Rens in lec 
5; = 0-000066 os Py a 
S, = 0:000066 ¢g 
lec, phetoaing fuid = 0-000073 gm. in 1 c.e. 
8, providing ee the pressure in the post-caval and connected 
ns ome approximately constant, the presence or absence of the 
venous supply to the iedaaye pry a no difference as regards the nitrogen 
strength of the urine. Nor so far is there any evidence that the rate of 
excretion of urine is affect 
ExPERIMENT 2,—Identical with the last save that t the r.a.v. were 
piahghir and cut behind in the ‘‘ shut vein’ ” part of the experi- 
that the cannula was smaller in bore (58°5 c.c. per minute 
re “ ems, ) and that ge aortic bottle was lowered to 25 cms. 
casi eut out. Twor . left open at commencement of experi- 
O aft |+1R = 0°35 c.c. (30 m.) [N.E.] ) Aorta perfused at 
Pen) IIL +IIR = 1°85 c.c. (90 m.) [1 ¢.c. = O} rate of sas ¢.c. 
pe nutes. 
Shut { TIL + TITR = 0°35 c.c. (13 m.) [N.E.] - ? Aorta perfused at 
IVL+IVR = 2:1 c.c. (90 m.) [l ¢.c. = 8] of c.c. 
nee 30 cialis. 
ee et 
LS paca. Low inle 
S = 0°004930 
1 c.c, ccastcman A fluid = 0:005848 gm. in |] c.c. 
Nitrogen Strengths. 
From — was left of the ‘‘ shut” and ‘* open mples of 
urin ok equal quantities and frand that io nitrogen 
reagiis were in the ratio of 19 (‘‘ open’’) to 10 (‘*shut’’). 
I cannot rere for this difference 
EXPERIMENT 3.—Iden gots _ Experiment 1, save that the aortic 
bottle was at 25 
Oo ofr nee 05 c.c. 130 1m.) [N. E.] Aorta perfused at 
Pe) TIL+1IR = 1°7 cc. (60 m.) [l ec. =O7 } rates of 183 c.c. 
( & 161 ¢.c. per 
tes. 
Sera 
END ES ees 0-7 c.c. (15 m.) [N.E.] ta perfused at 
( IVL+IVR = 2-25 c.c. (60 m.) [1 c.c. ee ates of 223 o. 
222 c.c. per 
so cite nutes. 
oO VL+VR = 0°77 c.c. (15 m.) [N-E.] Aorta perfused at 
pen { vit, VIR — 21 e.c, (euties =O) | Fates of 213 c.c 
& 208 per 
Ace stiraad 
