SUGAR, MOLASSES, CONFECTIONS, AND HONEY. 



649 



EXAMINATION OF SUGARS. 



A sample of pure granulated sugar, of a polarimetric value of ap- 

 proximately 99.7, was sent to the analysts, in order that they might use 

 it in testing their polariscopes and setting their solutions of copper. 

 Thus the same sample was used by all the analysts, and a comparison 

 of the polariscopes used can be easily made. 



The polarizations obtained by the several analysts were as follows : 



The reading, 99.73, was obtained by the examination of two solutions 

 of sugar, weighed separately. These solutions were read independently 

 by three skilled observers, and thirty-six readings were made. The 

 mean of these closely agreeing readings was 99.93. 



Checked with a standard quartz plate it was found that the instru- 

 ment read 0.2 too high. The true polarization of the sample sugar was 

 therefore 99.73 for the 200 mm tube. 



Comparing this number with the results obtained, the following ob- 

 servations may be made : 



Mr. Huston instrument 0.03 too low. 



Mr. Nicholson instrument 0.27 too high. 



Mr. Rising instrument 0.27 too high. 



Mr. Scovell instrument 0.07 too high. 



Mr. Sharpies instrument 0.17 too high. 



Mr. Stuhbs instrument 0.37 too high. 



Mr. Wallace instrument 0.07 too high. 



Mr. Weber instrument 0.33 too low. 



Mr. Wiechmann instrument 0.17 too high. 



The data of all the analyses following have been carefully examined 



| and in some instances appear to be anomalous. An attempt has been 



made to have these anomalous results corrected by the several analysts, 



but not always with success. For those that are still uncorrected the 



editor disclaims responsibility 



