NOHTHERN SUGAR INDUSTRY. 85 



Par cent. 



In semi-sirup: 



By direct polarization 29. 83 



After inversion 30. 08 



In sirup anrl molasses : 



By direct polarization 39. 80 



After inversion 38. 96 



In meladas : 



By direct polarization 51. 25 



After inversion 48.39 



In sugars : 



By direct polarization 90. 60 



After inversion 88. 59 



REDUCING SUGARS. 



These determinations were also made in duplicate, viz : 



(1.) By titration witli Fehling's solution, using potassium ferro cya- 

 nide to determine the end of the reaction. 



(2.) By the permanganate method described in Annual Report of De- 

 partment of Agriculture for 1880, pp. 42, 43. 



For raw juices the mean of all the determinations was — 



Per cent. 



By titration with Fehling's solution = 4.31 



With permanganate 4. 26 



For defecated juice : 



With Fehling's solution ...... 4. 26 



With permanganate 4. 28 



For semi-sirup : 



With Fehling's solution 16. 20 



With permanganate 16. 48 



For molasses and sirups : 



With Fehling's solution 25. 69 



With permanganate 28. 1 1 



For sugars : 



With Fehling's solution 3. 68 



With permanganate 3.81 



SUCROSE IN DIFFUSION WASTE WATERS AND PULPS. 



In these substances, when the percentage of sucrose was often less 

 than 1 per cent., only direct polarizations were made. 



From 50 to 100 grams of the material were used (in 100<^™ volume), 

 and the polariscopic readings made in tubes 500™"^ in length. 



OTHER SUGARS IN DITTO. 



The waste water was titrated without dilution with Fehling's solution 

 of one-tenth strength. For pulps 150 grams were weighed into a tared 

 dish, the weight made up with water to 750 grams. The mixture was 

 then boiled for an hour, water being added from time to time to make 

 up for loss of evaporation. After cooling, the original weight was re- 

 stored by adding the small quantity of water necessary. After filter- 



