132 Journal of the Asiatic Society of Bengal. [N.S., XVIII, 
of flow, i.e. on the quantity of fluid which flows through a given 
length of capillary in & given = d has no connection with 
fluid pressure! save in so far as pressure encreases rate of flow. 
In instore G (Part II) I have given the results of nine per- 
ments (six described in some detail and three 
radnskicived). in proof of the statement that quantity of urine 
depends on rate of flow of the perfusing fluid and not on fluid 
pressure. In Exp. Ser. A. I. P. increase of pressure occurs in 
the aorta and this produces an increase of rate of flow in the 
intertubular plexus, and the increased rate of production of 
urine must be due to one of these, though even here there is 
more proportionality between the initial increases of rates of 
flow and the increased quantities of urine than — is i 
these latter and the increases of pressure. In t xp. 
P.C.I.P. the increase of pressure occurs in the post- oral and this 
pressure must to a large extent be transmitted up the peti 
tubular plexus to the glomeruli, so that in this series we agai 
obtain increase of pressure in the glomeruli but selena 
with a decreased rate of flow in the intertubular plexus. 
Since in this series the quantities of urine produced show no 
relation whatever to the increase of pressure, it follows that 
the former must be a consequence of the rates of flow, since, 
like these latter, they fluctuate about a common level. Thus 
in the A.I.P. series increased output of urine may be correlat- 
ed either with increase of pressure or increased rate of flow; 
in the P.C.I.P. series, on the other hand, the output of urine 
is evidently correlated with the rate of flow, and, we may 
therefore conelade, is also correlated with rate of flow in the 
series A.I.P. ? 



usa (19), among others, has come to identical cone 

1 De So 
regarding | ithe relations between quanti ty of urine and rate of blood 
flow an onducted on the living ina 
2 I give the data in st ag Beckie A.LP. and P.C.1.P. for comparison. 
Series A.I.P. Iner of Aortic SraccesaaS nc cms., 30 ems., 40 ems. 
foo a Rate of Flow = ii, 1) 17°3 ¢.c.—50 
c.c.—115 c.c. 
(Amounts perfused per Sars 2 it - ¢.¢c.—82 
cc; poor | 
30 minutes) Rap: 3) 1s 7 c.c.—47 
Increase of Urine Output res ‘D) 08 too 
c.c.—1°25 ¢.c. 
(Amounts secreted in (Exp. 2) 0:18 c.c.—0° 
85 c.c.—1°2 ¢.c- 
30 minutes) (Exp. 3) 0°38 c.c.—0 
7.6 .c.— 0°05 
poi 2) 0¢ em.—5 ems. 
—T-5 ¢ 
Rates of Flow (Exp. 1) 76 c.c.—94 ¢.€ 
—115 ¢.c.—I31 ¢.¢ 
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