APPENDIX A. 
‘On the ie of Flow of Fluid through the Renal ebay the cone rere 
Afferent Veins, the Dor. ad Aorta and the a or Abdom 
Vein in Rana tigrin 
The frog in each of the five eligatrecpery conducted to ascertain the 
facts indicated by the above title was as usual pre epared in a manner 
to that described d in Ap mai Nj Part t1f A large-bore cannula 
ti dan 
sed at 24 cm 
on the right side of the body into the eee — a free 
or other factors were not available as avenues of escape for the fluid. 
The ureters were cut off close to the kidneys so that excretion might 
have free outflow 
Experiment 1. fo oon (made with tap water) was the perfus- 
xperiment set going at 9-40. Be- 
Gaui 10 0 and 10: 15 the aortic flow (A.f.) was 271 
¢.c., and the outflow during the same period from 
the post-caval cannula (P.C.f.) was 125 ¢.c., which 
pos 
with the walls 7 the vein. 
First daira 10-20-10°35 10°40-16°55 11°0-11°15 
r.a,V. open. 
A.f.=202 c.c. A.f.=176 c. e. A.f.=175 c.c. 
POL =1800rc. P.C.f.=135¢.c. P.C.F.=—134c.c 

At 11°15 I ligatured both the r.a.v. and cut both veins posterior to 
e ligatures. Both r.a.v. anterior to the Faas became very small, 
jak later filled out 
Second Phase : 11°20-11-35 1140-11-55 12°0-12°15 
r.a.v. shut. 
Afi=l74ec Af.=l74e0. A.f£.=175 c.c. 
P.C.f.=20¢.c. P.C.f.=22¢.c. P.C.f.=24 c.c. 
12-20-12-35 12°40-12-55 1-0-1°15 
A.f.=177¢0. A.f.=173¢.c. A.f.=168¢ (r.a.v. NOW 
P.C.f.=28 c.c. P.C.f.=32c.c. P.C.f.=35 c.c. _half-filled) 
1-20-1-35 ied 2°0-2°15 
A.£=163¢.c. Afi= cc. A.f,=161 c.c 
P.C.f£.==35 c.c. POfas oc P.C.f.=:31 cc. 
ince in se the flows of the two o phases of the experiment ! it 
is desirable to select for phoma the flows ace hose periods in 
which the aortic flows were as nearly as possible identical, we will select 
the flows of the last two periods of the first phase and compare with 
them the flows of the 4th, 5th and 6th periods of the second phase, since 
gh GLE = esi yagi al aka Ineo Ns ROO aed cae eas gina nl 

