17 



On page 78, strike out section "15. Determination of Dextrin" and 

 substitute therefor ''Determination of Glucose," referring to method 

 given on page 48, section 12. 



15. DETERMINATION OF GLUCOSE. 



Dissolve half the normal weight of jelly or other fruit product, or the normal weight of 

 juices, clarify, and invert as directed under polarization (p. 16}. Polarize in jacketed 

 tube at 86 C. , and calculate the percentage of commercial glucose as directed on page 48, 

 Bulletin 65. 



XIV. FERMENTED AND DISTILLED LIQUORS. 

 Twentieth. Convention, 1903, Bui. 81, Cir. 13. 



On page 96, under "2. Determination of Alcohol," for the words 

 "Measure 50 cc of the sample (at 15.6 C.) into a distilling flask" sub- 

 stitute the following: "Weigh or measure (at 15.6 C.) in a distilling 

 flask 20 to 25 cc of the sample." 



Under "3. Determination of Extract," substitute the following 

 method for the one there given: 



Weigh or measure (at 15.6 C.) 100 cc of the sample, evaporate nearly to dryness 

 on the water bath, then transfer to a water oven, and dry at the temperature of boil- 

 ing water. 



Under "5. Determination of Acidity," substitute the following 

 method for the one there given: 



Titrate 100 cc (or 50 cc diluted to 100 cc if the sample is dark in color) with deci- 

 normal barium hydroxid, using phenolphthalein as indicator. The number of cubic 

 centimeters employed is multiplied by 0.006 for the acidity expressed in grams of 

 acetic acid per 100 cc. 



Under "7. Determination of Fusel Oil," strike out the third para- 

 graph and substitute the following: 



Add a small quantity of alkali to 200 cc of the sample under consideration and dis- 

 till slowly till about 175 cc have passed over, allow the distilling flask to cool, add 25 

 cc of water, and distill again until the total distillate measures 200 cc. Dilute the 

 distillate to exactly 30 per cent by volume & (sp. gr. 0.96541 at 15.6). 



On page 98, strike out the method given under "9. Determination 

 of Ethereal Salts" and substitute the following: 



9. DETERMINATION OF ETHEREAL SALTS. 



Neutralize the residue left after distillation in the fusel oil determination with 

 N/10 H 2 SO 4 and add an excess of 10 cc of the acid. Let stand five minutes and make 

 up to 200 cc. Titrate 2 portions of 25 cc each, using as indicators methyl orange in / 

 the first and phenolphthalein in the second. The difference gives the amount of alkali V 

 necessary to neutralize the organic acids in 25 cc of the sample. By subtracting 

 from this figure the number of cubic centimeters of alkali required for the free acids, 

 and multiplying the result by 0.0088, the number of grams of ethereal salts (calcu- 

 lated as ethyl acetate) in 25 cc of the sample is determined. 



[Note by the Editor. See also action taken in 1905 in regard to this 

 section.] 



