39 



EXTRACTION. 



The percentage of sucrose left iii the spent chips was .73. Sucrose in cane was 

 11.03 per cent. The per cent, of extraction is therefore 11.03 .73 = 10.30 -f- 11.03 X 

 100 = 93.4. 



SECOND TRIAL. 



Another trial was made of the diffusion machinery, beginning December 9. Car- 

 bonatatiou was again used, but without lignite or any further treatment. The juice 

 passed directly from the filter presses to the double-effect pan. 



The quantity of lime employed was .6 per cent, the weight of the juice. The filtra- 

 tion was perfect. The experiment was remarkable in showing that a perfect defeca- 

 tion can be made with carbonatation with a much smaller percentage of lime than 

 had been supposed necessary. 



The masse cuite was dark, but the sugar a fair yellow. 



Following are the data of the run : 



TABLE No. 40. Second diffusion run, December 9, 1887. 



Yield of lirst sugar per ton pounds. . 182 



Yield of second sugar per ton do 43 



Cane used tons . . 90 



The total sugar iu the cane at 90 per cent, juice was per ton.. 226.98 



Of these there were obtained 128 pounds at 96.6 123.6 



And 43 pounds at 87.3 37. 5 



Total pure sucrose obtained per ton . . 101. 1 



Pure sncrose left in chips do 17.8 



JMi re sucrose left in molasses and lost in manufacture do 41. 1 



Third sugar estimated do 17. 



Percentage sugar in c;ino extracted 9'J. 16 



The poor yield was due to use of thick chips during the first part of the run 

 causing a loss of 1.6 per cent, sucrose in the chips. 



