APPARATUS. 337 



ing point, and add urine to the tube directly, continuing 

 such additions and bringing to the boiling point sub- 

 stantially as in performing the regular analysis. If, 

 when the amount of urine thus introduced shall be equal 

 to the original volume of the test solution, and there be 

 no change of color, it may safely be assumed that sugar 

 is not present. 



Even when the regular analysis is contemplated, the 

 preliminary trial test should be instituted. For instance, 

 we do not care to attempt the regular analysis, when 

 by the rough test we are assured that there is no sugar 

 in the specimen. Again, when, by the trial test, it shall 

 be found that sugar is present, and in large amount, 

 then it may sometimes be better to dilute the urine 

 with an equal, or even six times its volume of water; 

 of course, allowing for this reduction in the computa- 

 tions after reading the burette; the accuracy of the 

 analysis is enhanced by the dilution ot the urine. It 

 may be further remarked that different specimens be- 

 have somewhat differently. The directions given will, 

 however, be found ample, and the practitioner having 

 frequent use for the sugar test in a short time becomes 

 perfectly at ease with the manipulations. 



Analysis for Albumen. The volumetric method, one 

 of " trial and error," involving several filtrations, is 

 somewhat tedious ; too much so for the practical pur- 

 poses of the medical practitioner. The author was 

 hence induced to experiment with the "Marais" ap- 

 proximate tubes comparing results with those obtained 

 by two of the regular methods. These were so far sat- 



22 Microscopy. 



