20 



uct is exhausted with warm alcohol, the liquid filtered, and made up with alcohol 

 to 100 cc. If the sample of spirit be pure, the tint of the liquid is red, but in pres- 

 ence of 1 per cent of methyl alcohol it has a distinct violet shade; with 2.5 per cent 

 the shade is very distinct, and still more so with 5 per cent. To detect more minute 

 quantities of methyl alcohol, 5 cc of the colored liquid are diluted to 100 cc with 

 water, and 5 cc of this 'again diluted to 400 cc. The liquid thus obtained is heated 

 in porcelain, and a fragment of white merino (free from 'sulphur) immersed in it for 

 half an hour. If the alcohol be pure, the wool will remain white; but if methyl- 

 ated, the fiber will become violet, the depth of tint giving a fair approximate indi- 

 cation of the proportion of methyl alcohol present. 



Add the method of Leach and Lythgoe for the estimation of ethyl 

 and methyl alcohol in mixtures of the same, to the provisional methods. 

 This mixture is modified for different liquors, and the following is 

 more specifically for whiskies: 



(C) LEACH AND LYTHGOE METHOD. 



Weigh 50 grams of sample, mix with 75 cc of water, and distill 100 cc. Determine 

 alcohol in the distillate as directed under "2. Determination of Alcohol," and 

 proceed as directed on page 14. 



