ON THE INVEESION OF CANE SUGAR. 



Solution taken out Eotation of the bolution 



in grams. diluted to 25 c.c. 



Inverted in the original solution. 



'•' is; 



•M(6 

 {à) I 



(1) 6.3341 -6.282° 



(2) 6.3398 -6.270° 



(3) 6.3391 -6.272° 



(4) 6.3565 -6.290° 



Inverted in the dilute solution. 



.(5) 6.4350 -6.646° 



^''^ \q) 6.3612 -6.608° 



(7) 6.4488 -6.660° 



(8) 6.4067 -6.608° 



In order to obtain the mean value of the rotations of the 

 solutions of the same treatment and to be able to compare those 

 of the solutions of different treatments with each other, it was 

 assumed that within narrow limits of concentrations, as in the case 

 in hand, the rotations are proportional to the concentrations of 

 the solutions. The average amount of the solutions taken out in 

 eight instances was 6.3776 grams and the rotation of it diluted 

 to 25 c.c. was calculated from the above data as follows : 



|(1) -6.325° r(5) -6.587° 



^''^ 1(2) -6.307° ^""^ 1(6) -6.625° 



r(3) -6.310° I (7) -6.586° 



^ ^ 1(4) -6.311° ^ ^ 1(8) -6.578° 



Mean: -6.313° Mean: -6.594° 



25 c.c. of the original solution weighed 32.793 grams and 

 contained 20 grams of sugar, so that 6.3776 grams of the solution 

 contained 3.8896 grams. The same amount of sugar was dissolved 

 in water with the addition of sodium acetate and hydrochloric 



