FORMATION OF LACTIC ACID FROM CANE SUGAR. 107 
dried lactate of lime. The expressed liquid gives a residue 
of 82 1 grms., containing 16- 91 grms. lime. 
300 grms. sugar, 1400 grms. water, &c , gave under the 
same circumstances 213 grms. crystallized lactate of lime. 
The residue evaporatad in the water-bath, weighed only 29 
grms., in which were found 6-01 grms. lime. 
These experiments prove, at all events, that 92 percent, 
of the constituents of the sugar, which have not escaped in 
a gaseous state, have become converted into lactic acid, and 
probably, if we suppose the 6-01 grms. lime contained in 
the evaporated residue lo be combined with 17*2 grms. lac- 
tic acid, even 99 per cent. 
3. 1400 grms. cane sugar were dissolved in 6000 grms. 
water and 400 grms. moist (containing 94 grms. dry) case- 
ine, and a sufficient quantity of finely-pulverized chalk 
mixed with it, and the whole exposed to a temperature of 
77° to 86°. For the first 14 days the liquid remained per- 
fectly clear with exception of the sediment, and retained a 
sweet taste ; but soon the separation of crystalline lactate 
of lime took place with an apparently considerable evolu- 
tion of gas, and in the course of 4 weeks the whole mass 
formed a crystalline paste, as in the previous experiments. 
After one re-crystallization 870 grms. crystallized lactate of 
lime were obtained; and the mother-ley, somewhat evapora 
ted, yielded 162 grms. crystallized mannite. The latter 
however was not perfectly pure, and contained 3-6 per 
cent, lime, probably in combination with lactic acid. In 
the liquid separated by filtration and pressure from the 
mannite, there subsided, on evaporation over the water- 
bath, a further quantity of minute crystals of mannite, 
which however could not be isolated from the syrupy li- 
quid, and the whole was therefore evaporated in the water- 
bath. The residue obtained in this manner weighed 732 
grms., and contained 12| per cent, lime. 
350 grms. of this dry residue were dissolved in 1200 grms 
water, mixed with caseine and pulverized chalk, and pla* 
