122 Journal of the Asiatic Society of Bengal. [N.S., XVIII 
secreted by the ligatured kidney and the greater percentages of 
— and chloride in the urine secreted by the ‘‘ normal’ 
idney. The excess of blood in the renal afferent vein of the 
‘“‘normal”’ kidney raises the pressure in the renal venous mesh- 
work and this retards the flow of the arterial blood in the inter- 
tubular plexus,' and since quantity of urine is strictly depen- 
dent on the flow of this arterial blood, the quantity of urine 
secreted by the “normal” kidney is in consequence less than 
the quaiitiey of urine secreted by the ligatured kidney,” which is 
altogether devoid of a venous supply.* Again, the excess of 
stom ye in the renal afferent vein of the “normal” kidney 
ses the venous blood to mix to a slight extent with the 
seen blood in the intertubular plexus (vide Part I on the 
results of a slight excess of venous pressure in perfusion 
experiments) and this venous blood containing a greater 
percentage of nitrogen* than the arterial blood, the result is 
that the urine secreted by the “normal” kidne ey is slightly 
stronger in nitrogen than the urine of the ligatured kidney. 
It is true that the increase of pressure in the intertubular 

_ | This retardation of the arterial flow by see hm ol a pressure 
in the renal afferent vein I have proved on m perfusi 
\ ore d su Ppos 
intertubular ¢ he than the ligatured kidney can surpass the 
ligatured kidney so little in its powers of absorption of water from the 
glomerular filtrate as to reduce the output of urine only by i ——. If quan- 
tity of blood counts, the reduction in urine output should be ; 
e ascertained in a number of careful ——— that the 
ssi tng of the renal aed vein does not accelerate the flow of the 
arterial blood in the intertubular plexus and — oes not increase 
the preps of urine produced b kidne 
venous blood in these experimental frogs is schon richer in 
nitrogenous material relative to the arterial blood than n 
0 eo the former P (see Part I,p. ) becomes artificially ; greater i 
proportion to B owing to the latter ssaliaa lowered in value by es removal 
of tissue in the prodaratien of the frog. 
