PREPARATION OF CIDER AND FRUIT-WIXES. 327 



15 1944 ; this number divided by 100 15 = 85 gives 22.87. 

 Deduct from this 5.4, and there remain 17.47 kilogrammes of 

 sugar which have to be added to the must to give it 15 per cent, 

 of sugar. 



For 325 liters of must with 3J per cent, of sugar to be changed 

 into must with 20 per cent, of sugar the calculation Avould be as 

 follows : 



(325 11.375)20 ^ 313.625 x 20 _ 

 10020 80 



o-| q #9 re 



p 1 = 78.406 11.375 = 67.03 kilogrammes of sugar to 



be added. 



600 liters of must with 6 per cent, of sugar are to be changed 



into must with 22 per cent, of sugar : : X U 36 = 117.4 



O\J 



kilogrammes of sugar. 



The above examples will suffice to enable any one to execute 

 the calculations as required. 



The above calculations are based upon pure, anhydrous grape 

 sugar, an article which does not exist in commerce, and hence has 

 to be replaced either by commercial grape-sugar (glucose) or cane- 

 sugar. Glucose, however, containing as a rule only 67 per cent, 

 of anhydrous grape-sugar, 1J times the quantity calculated above 

 must be used, thus in the last example 176 kilogrammes instead of 

 117.4. With cane-sugar the proportion is the reverse, 171 parts 

 by weight of cane-sugar being equal to 180 parts by weight of 

 anhydrous grape-sugar ; hence the per cent, of anhydrous grape- 

 sugar calculated according to the above method must be multi- 

 plied by the fraction -j-|- T or the factor 0.95. According to this, 

 instead of the 117.4 kilogrammes of grape-sugar in the last 

 example, 111.73 kilogrammes of cane-sugar will have to be used. 



Glucose. Pure glucose being identical with the sugar in sweet 

 fruits its use for sweetening fruit-juices intended for the prepara- 

 tion of wine is perfectly justifiable. With the dispute still carried 

 on with honest weapons, whether it is permissible to assist nature 

 with glucose when it fails to succeed in its labor of forming sugar 

 in abundance, we have here nothing to do, since we know that 

 the principal product alcohol or spirits of wine and almost the 



