172 Journal of the Asiatic Society of Bengal. [N.S., XVIII, 
Of the renal afferent veins, we may a that in the toad about 3/5 of 
the venous blood flows to the heart via the anterior abdominal and liver 
capillaries and 2/5 _ = renal venous Piasakee Gee of both kidneys, and in 
Bee: the two rou 

opening directly into the main venous system ; and t eat is con- 
firmed by the bn of the abnormal frog CH (text ‘igure 5), the sectional 
area of the lef a ** renal pany > vein (posterio sole of the 
posterior pngeanl being 0-570 sq. mm. and th tof _ anterior abdominal 
eing 0°679 
teri al 
From these data then, we may conclude that the anterio P abdominal vein 
and liver capillary system offer only a little more pest es e to flow of 
venous blood into the heart than a persistent posterior cardinal vein open- 
ing directly into a precaval vein, but that, on the other hand, the renal 
venous meshwork of one kidney offers a resistance two cB. ‘fenaparaniaa or 
three (Indian toad) times as ta 
APPENDIX E. 
Details of the Perfusion Experiments on Fro ogs’ Kidneys eee with 
and without the Renal Afferent Vein Suppl 
I supply the pater of these experiments because my results, as 
venaida the saline strengths of the sam sia of urine, are distinctly con- 
radictory of those of Bainbr ridge, Collins and Menzies (Proc. Royal Soc., 
Vol. 86, 1913), and because it is important that the data on rebeece I have 
ased the conclusions stated in the text sho uld be availa 
EXPERIMENT 1.—In this se pegre only one cannu a (74 ¢.c. per 
minute at 24 ems.) was use d (inserted into the coeliaco pe 
ge 3 Mp? fluid ghee 0: 0% saline + 40 c.c. human urine added 
2,000 c 
The 
going at 9-0, both the renal afferen _— (r.a.v.) being left open. 
Put first pair of ‘urine oe tubes bai 10- 
Open. IL + IR2 3°75 (30 minutes) = open vein urine 
[L c.c. = Oj] [10° 15-10- 45 sorta a oe 363 ¢ 
At 10-461 a the twor.a.v. between ven — of oes 
Piceke silciaias are of course only ri Cija omer meee sufficien 
for present purposes. I attem pted to as experimentally the ke 
saa tafe of perfusion fluid via trent sess vom he anterior abdominal 
an & 
he 
ae with equal nozzle bores (i.e. with equal rates of flow at the same 
pressure d Insert tw into the t nt veins 
connect both to the branches of a forked tube connected wit er- 
fusion bottle ; the third cannula would have to be i ted into the poste- 
rior end of the anterior abdo ars vein and connected with a second per- 
veer ~ joa with a “ head” uid equal to that in the other bottle. 
+IR = Ist left re Fon tube urine contents + Ist right ditto. 
se ee Wee line ye 






