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1276 PHYSIOLOGY 



the kidney-volume, or even in the rate of blood-flow through the 

 kidney (as determined by Brodie's method). The general rule, how- 

 ever, is that a greater rate of blood-flow is obtained pari passu with 

 the increased urinary flow ; and a consideration of certain peculiarities 



V 



\ 



Art. BP. mm Kg 



Haemoglobin 



Percent. 

 I 



Kidney Volume 



Urine 



40 



:>Q GO 70 80 90 100 110 120 130 HO 150 



FIG. 531. A comparison of the effects of intravenous injection of 30 grm. 

 glucose in concentrated solution on the arterial blood pressure, the con- 

 centration of the blood, the kidney volume, and the urinary flow. 

 [ Abscissa = time in minutes. 



in the renal circulation must prevent us from laying too much stress 

 on apparent exceptions to the rule. To the blood entering the kidneys 

 by the renal arteries two ways are open. The blood may pass through 

 the vasa afferentia, through the glomeruli and tubular capillaries, back 

 to the renal vein. On the other hand, it may escape the glomeruli 

 altogether, and pass through the vasa recta directly into the inter- 

 lobular capillaries and so into the renal veins. It is a common experience, 

 in injecting the blood-vessels of the kidneys post-mortem, to find the 



