THE DETERMINATION OF CANE SUGAR 



491 



The definition of the gravity solids, or degree Brix, or of the refractive 

 solids, presents no difficulty when the material is examined in its original 

 condition. If the bodies present, other than sugar, gave the same relation 

 between dilution and specific gravity as does sucrose, the dilution at which a 

 determination is made would be a matter of indifference. On experiment, 

 however, the following relation^ is found to hold for impure solutions : — 



If from an impure sugar solution containing q per cent, gravity solids, 

 or refractive sohds, dilutions be made containing Qy per cent., Q2, percent., 

 etc., of the original material, and if these solutions contain q^ per cent., ^2 per 

 cent., etc., gravity or refractive solids, and if Qi> Qi> Qz> then : — 



i3_ ^ ?2^ > _li > 1_ 

 <?3 <?2 <?i 100 



On the other hand, the absolute solids are independent of dilution, 

 as are also the gravity and refractive solids of solutions of cane sugar. This 

 follows from the definition. 



The gravity soUds and refractive solids in a solid or in a semi-solid solution 

 can only be obtained after a controlled dilution, and, following on the above 

 statement, different resvilts will be obtained dependent on the dilution. 

 Experiments made by the writer gave the results tabulated below. The 

 method of calciilation used was as follows : — A syrup was of density i • 35643 

 at 27-5° (;. /27-5° C. ; it thus contained 71-290 per cent, gravity solids; 

 a 63-701 per cent, solution of this syrup was of density 1-206798 at 27-5° 

 C. /27-5°C. and hence contained 45-609 per cent, gravity solids. Calculated 

 back, the original material contained (45-609/63-701) X 100 = 71 'SQ^ per 

 cent, gravity solids. 



The variation in the degree Brix, or gravity solids, and of the refractive 

 solids in a raw sugar, a syrup and a molasses, as affected by dilution, is shown 

 in the following tables. 



Variation 



IN "Solids" in a Raw Cane Sugar with Dilution as calculated 

 FROM THE Observed Solids at the Stated Dilution. 



The Raw Sugar contained 99 -005 per cent. Absolute Solids, 96 -30 per cent. 

 Sugar, and o -55 per cent. Ash. 



