92 THE FORMATION OF FAT IS 



* + HuA,) 24 = C^H^Ou = 6 eq. alcohol. 



These 24 equivalents of oxygen suffice to oxidise 

 completely a third equivalent of sugar that is, to 

 convert its carbon into carbonic acid and its hydro- 

 gen into water, and by this oxidation we recover the 

 12 equivalents of water supposed to be added in the 

 former part of the process, exactly as if this water 

 had taken no share in it. 



C 12 H 12 12 + O^ = 12C0 2 + 12HO. 



According to the ordinary view, 12 equivalents of 

 carbonic acid separate from 3 of sugar, yielding 6 

 of alcohol that is, exactly the same amount of these 

 products as if two-thirds of the sugar had yielded 

 oxygen to the remaining third, so as completely to 

 oxidise its elements. 



CHH.A, = C^Ou, + 12C0 2 .* 



By a comparison of these two methods of repre- 

 senting the same change, it will easily be seen that 

 the division or splitting of a compound like sugar 

 into carbonic acid, on the one hand, and a compound 

 containing little oxygen, on the other, is in its results 

 perfectly equivalent to a separation of oxygen from 

 a certain portion of the compound and the oxidation 

 or combustion of another portion of it at the ex- 

 pense of this oxygen. 



It is well known that the temperature of a fer- 

 menting liquid rises ; and if we assume that a hogs- 

 head of wort, holding 1,200 litres = 2,400 Ibs., 



* For an explanation of the formulae and equations employed, 

 see the Introduction to the Appendix. 



