ON VOLUMETRIC ANALYSIS. 319 



scntation of a genuine ' tube-cast " ; while on the other 

 hund the learner depending entirely on the information 

 conveyed to the eye by the plates is surely liable to be 

 misled. It is very far from our purpose to make any 

 attack on the English authorities mentioned; from 

 -either of them we have derived a great deal of useful 

 .and valuable information, and they are to-day works, 

 to which we make frequent reference. And then again 

 we doubt seriously, if an accurate idea of a " pale 

 hyaline cast " can be conveyed by means of drawings. 

 The learner, however, may rely on the text of our 

 favorite authors, and at the same time use due care 

 that not every adventitious filament, hair, etc., be ac- 

 cepted as a genuine " tube-cast." 



To detect with certainty a genuine " cast," one of 

 the feebler order requires just as much care and study 

 .as would be required to show the lines on the Nos. 18 

 or 19 of the Moller test plate, and requires also just as 

 good instrumentation. 



Having thus alluded to one serious source of error, 

 we have to say that it is no part of our purpose here to 

 write a treatise on urinary deposits, although we hope 

 to accomplish something in this line at no distant day 

 our present purpose is to give the medic a hint or two 

 as to the little apparatus required in the volumetric 

 analysis of urines, and to instruct him in the prepara- 

 tion of the necessary chemical solutions employed in 

 such analysis; $15.00 or even less will purchase a tol- 

 erably effective outfit. 



