ON THE INDUSTRY OF BEETROOT SUGAR. 
201 
The manipulation of the beet-juice was similar to that 
used for the cane-juice, only the use of triple effects and 
filtration over animal charcoal was indispensable. The 
molasses from the first jet (product) were re-boiled ; the 
molasses from the second jet purified by Dubrunfaut’s pro- 
cess, called “ Osmose” (diffusion through parchment paper in 
contact with water), and gave a third crystallisation of sugar, 
polarising 92 per cent. By these means the following average 
figures of a whole crop in 1878-79 were obtained: Beets 
worked up, 25,750 tons ; polarisation of the beets, 12 to 17 
per cent. ; return in crystallised sugar, first jet, 2,301 tons, 
polarising 96 per cent. = 8-98 per cent, from the weight of 
the beets ; second jet, 230 tons, polarising 94 per cent. 
= 0*89 per cent. ; sugar obtained by osmose, 225 tons, 
polarising 92 per cent. = 0-87 per cent. ; total 2,756 tons, 
= 10*7 per cent. You will see that from the 12-17 per cent, 
of saccharine matter of the beets, 10 '7 per cent, were obtained 
and crystallised. In shape of masscovite 11-34 per cent, 
were obtained, consequently there was only a loss of 0-83 
per cent. To produce one ton of sugar, 9 35 tons of beets 
were required, or 100 tons of beets yielded 10°7 tons of 
sugar. Such results are only surpassed by a very few usines, 
as S. Madeleine, where 9-5 per cent,* of first sugar have 
been obtained. 
In 1872, the average return of the fifteen usines of Mar- 
tinique was only 7 *86 of sugar (report by K. H. Burton). 
In 1879, one of the usines in that island obtained 7*25 per 
cent. ; and in 1880, after the introduction of Faure’s “ De- 
fibreur” (which increased the return of the mill in juice to 
80 per cent.), 8'35 per cent. 
* From the weight of the canes. 
