CHAPTER XX. 



URINE: ORGANIZED AND UNORGANIZED 

 SEDIMENTS. 



THE data obtained from carefully conducted microscopical exam- 

 inations of the sediment of certain pathological urines are of very 

 great importance, diagnostically. Too little emphasis is some- 

 times placed upon the value of such findings. 



FIG. 97. 



FIG. 98. 



THE PURDY ELECTRIC CENTRIFUGE. 



SEDIMENT TUBE FOR THE PURDY 

 ELECTRIC CENTRIFUGE. 



The sedimentary constituents may be divided into two classes, 

 i. e., organized and unorganized. The sediment is ordinarily col- 

 lected for examination by means of the centrifuge (Fig. 97, above). 

 An .older method, and one still in vogue in some quarters, is the so- 

 called gravity method. This simply consists in placing the urine 

 in a conical glass and allowing the sediment to settle. The col- 

 lection of the sediment by means of the centrifuge, however, is 

 much preferable, since the process of sedimentation may be ac- 



343 



