THE ANALYSIS OF SUGAR-CANE AND BEKT-JUrKS- WITH \ 

 TABLE FOR THE CALCULATION OF ANALYSED 



C. A. CRAMPTON. 



In the routine work of cane- and beet-sugar houses the greater part 

 consists in the analysis of large numbers of samples of juice. A met hod 

 of manipulation for these analyses is therefore desirable, which will 

 unite a reasonable degree of accuracy with considerable speed. The 

 method and routine of analysis given below has been pursued by myself 

 and others for several years in the work of the United States Depart- 

 ment of Agriculture in its experiments on sorghum and sugar-cane, and 

 found very expedient in the brief a sugar season," when the saving of 

 time is so important an object. 



For very accurate work, of course it is necessary to weigh out the 

 sample of juice taken for analysis, but for all ordinary purposes the sam- 

 ple may be measured by volume, increasing greatly thereby the rapidity 

 of the operation. By taking the specific gravity with accurate spindles, 

 having their graduations well spaced, and correcting the volume taken, 

 a very close approximation to the actual weight is obtained ; this oof 

 rection may be applied in two ways : 



(1) By dividing the normal weight for the polariscope. <>r a multiple 

 of it, by the specific gravity of the juice, to find the number of cubic cen t i 

 meters of the liquid exactly corresponding to this weight, and then meas- 

 uring out this quantity from a burette into a lOOcc. ilask, adding sub 

 acetate of lead solution, making up the volume to lOOcc., filtering and 

 polarizing. The reading of the polariscope gives directly the percentage 

 of sugar in the juice, only multiplied by the number of times the normal 

 weight was taken. 



(2) By measuring out a certain volume of the juice, adding lead solu- 

 tion, making up to another definite volume, polari/ing and applying the 

 correction for specific gravity to the reading obtained. 



I prefer the latter method as more expeditious and convenient, lor in 

 the other the specific gravity must be determined and the calcul;r 

 made before the sample for polarization can !>< taken: while in the see 

 oud method the specific gravity may be taken at any lime tluongli tbe 

 day, and the calculation of the results postponed indefinitely. 



