160 AMOUNT OF ALCOHOL IN WINE. 



p. 145). The spirit which passed over, being diluted 

 with water to 200 CO., had a specific gravity =0'985S. 

 The wine remaining in the retort, when re- diluted 

 with water to 200 CO., had a specific gravity = T0089. 

 Specific gravity of wine 0*9951, minus 0089=0'9862. 

 0*9862 gives 10*3 per cent, absolute alcohol, whilst 

 the specific gravity of the spirit which was distilled 

 over=0'9858, and this gives at 95 5 F. 15 5 C. 10-6 

 per cent, alcohol. 



Thus Bordeaux wine contained 10'5 per cent, alcohol 

 by volume, showing a difference of 3- per cent. 



The experiment was repeated upon the following 

 wines 



Port wine, specific gravity = 0*9970. 



Spirit distilled from it, and restored by the addition 

 of water to its original volume = 0*9763. 



The specific gravity of the wine, freed from alcohol, 

 and diluted by water to its original volume = T0205. 



9970 0*0205 = 0-9765, which, at a temperature of 

 from 48*2 F. 9 C. to 50 F. 10 C. (at which all these expe- 

 riments were made), gives 20 per cent, alcohol in the 

 wine, whilst 0'9763, the ascertained specific gravity of 

 the spirit, gives 20J per cent, alcohol. Here, then, is a 

 difference of J per cent., which, however, in expe- 

 riments of this kind may be safely disregarded.* 



* I may here observe that the determinations of sp. gr. all through 

 this treatise were made by weighing a glass pear, a description of 

 which is given in the investigation of sea water (Scheik. Onderz. 

 deel. 6, p. ],) and the weighings were made with a balance which was 

 sensitive to O'l milligramme (O'OIO grain). 



