74 



These alkaline substances, lime, salts of potash 

 and soda, prevent the crystallization of a certain 

 portion equal to about 5 times their weight, so that, 

 if beet juice contains 12 pounds of sugar and one 

 half pound of these substances, the latter prevents 2J 

 Ibs. of sugar from crystallizing.' 



Thus we have seen that sugar forms with lime a 

 sucrate of lime : this sucrate contains per 100. 



Lime 14 parts. 



Sugar 86 " 



100 " 



This property as we have seen is used for purify- 

 ing purposes. 



$ 7. OF BEET JUICE. 



Beets reduced to pulp and heavily pressed give 

 about 80 per cent of highly colored juice. The 

 average components of this juice are 



Sugar . 12 Ibs. 



Azote substances H * 4 



Salts f " 



Water... . 86 " 



100 



The azote substances must be eliminated before 

 the sugar can be extracted. Azote substances are for 

 the greater part eliminated by the use of lime. But 

 notwithstanding the care taken in purifying, a por- 



