124 Journal of the Asiatic Society of Bengal. [N.S., XVIII, 
afferent vein. On the other hand, I showed that a very small 
excess of pressure (flow) in the renal afferent vein causes the 
46 fluid ” to affect the urine secreted by the actual penetra- 
tion of the renal afferent vein fluid into the intertubular plexus. 
The explanations of the differences in the amounts of urine 
secreted and in chloride strengths are also, as I have already 
stated, in accordance with the results described in Appen- 
dix G. 
explanation which I have provided to account for the results 
I have described in this Part ITT. 
Repetiticn of Gurwitsch’s Experiments on the Excretion of 
e Respectively by K tdneys Deprived of their Renal 
Afferent Venous Supply and by «* Normal”? 
Kidneys in the same Frog. ; 
Gurwitsch states that in frogs operated on as usual from 
the dorsal surface, with dye injected into the blood, the urine 
of the ligatured kidney becomes only slightly coloured whereas 
into the arm muscles several] ¢.c. of a solution of 0:2 gm. of 
sodium sulphate dissolved in 100 c.c. of 0°5% saline as a 
diuretic, and later, when urine was being excreted, several ¢.c. 
of a deep-blue solution of indigo-carmine in 0-5%, saline, also 
i The ligatured kidney urine of the first 
experiment was, in intensity of coloration,' to that of the 

> 1. The samples of urine were i i 
I : Placed in narrow tubes of equal calibre 
and their depths adjusted until they were of the same codeceanl verti 
cally over white paper 
. 
: 
