116 Mr Roy, on the mechanism of the renal secretion. 



potash, resemble salt solution in causing a primary expansion of 

 the renal vessels. 



25. Injection into the veins of denbrinated blood or serum 

 of the same species causes only an expansion of renal vessels when 

 an evident increase in the blood-pressure is produced by the quan- 

 tity injected. 



26. All the diuretics mentioned, when they are given in not 

 too large a dose, cause a very considerable change in the volume of 

 the kidney without causing any change in the blood-pressure. 



27. All of the diuretics mentioned have exactly the same 

 influence upon the renal vessels when injected into the blood after 

 complete section of the nerves which accompany Hie renal vessels. 

 Their action is, therefore, not due to any vasomotor influence trans- 

 mitted from the spinal centres, but is due to the influence of the 

 change in constitution of the blood either upon the walls of the 

 renal vessels directly, or upon some peripheral vaso-regulating 

 mechanism of a nervous nature contained in the kidney itself. 

 The evidence in favour of one or other of these views would be out 

 of place in a preliminary communication such as this. 





