310 PRACTICE OF PHYSIC. 



urine without blood that I have ever seen ; and I think a little 

 experience will enable most persons to make this distinction. 



2dly, By this, that the presence of blood always diminishes 

 the transparency of the urine with which it is mixed ; and it is 

 very seldom that urine, though very high-coloured, loses its 

 transparency, at least this hardly ever appears, if the urine is 

 examined when recently voided. 



3dly, When urine has blood mixed with it, it tinges a piece 

 of linen dipt into it with a red colour, which the highest colour- 

 ed urine without blood never does. 



4<thly, High-coloured urine without blood, upon cooling, and 

 remaining at rest in a vessel, almost always deposites a lateri- 

 tious sediment ; and if, upon any occasion, bloody urine should 

 deposite a sediment that may be of a portion of the blood for- 

 merly diffused in it, the difference, however, may be discerned 

 by this, that the sediment deposited by urine without blood, 

 upon the urine's being again heated, will be entirely re-dissolved, 

 which will not happen to any sediment from blood. 



Lastly, We know no state of urine without blood, which 

 shows any portion of it coagulable by a heat equal to that of 

 boiling water ; but blood diffused in urine is still coagulable by 

 such a heat : And by this test, therefore, the presence of blood 

 in urine may be commonly ascertained. 



