6 



the weight of the phloroglucid obtained shall not exceed 0.300 gram, 

 is placed in a flask". 



After the word "added/' in the third sentence, beginning "The 30 

 cc driven over", insert the following: "by means of a separatory fun- 

 nel and". 



Nineteenth Convention, 1902, Bui. 73. 



Page 25, under " (e) Provisional method for the determination of 

 pentosans by means of phloroglucin," thirteenth line, "The solution", 

 etc., to end, substitute the following: 



The solution is made up to 400 cc with 12 per cent hydrochloric acid, and allowed to stand 

 overnight. The amorphous black precipitate is filtered into a tared gooch through an asbes- 

 tos felt, washed carefully with 150 cc of water in such a way that the water is not entirely 

 removed from the crucible until the very last, then dried to constant weight by heating four 

 hours at 100 C., cooled, and weighed in a weighing bottle, the increase in weight being reckoned 

 as phloroglucid. To calculate the furfural from the phloroglucid, use the following formulae: 

 For weight of phloroglucid (a) under 0.03 grams: 



Furfural=(a+0.0052) X 0.5170. 

 Pentoses=(a+0.0052) X 1.0170. 

 Pentosans=(a+0.0052) X 0.8949. 



For weights of phloroglucid (a) from 0.03 grams to 0.300 grams Krober's table a is recom- 

 mended. If this is not available use the formulae: 



Furfural=(a+0.0052)X0.5185. . 

 Pentoses= (a +0.0052) X 1.0075. 

 Pentosa=ns(a+0.0052) X 0.8866. 

 For weights of phloroglucid (a) over 0.300 grams. 



Furfural=(a+0.0052) X0.5180. 

 Pentoses=(a+0.0052) X 1.0026. 

 Pentosans=(a+0.0052) X 0.8824. 



a J. Landw., 1900 48:375; Tollens, Zts. angew. Chem., 1902, 15: 477, 508; Zts. physiol. Chem., 

 1902,36:239. 



Krober's factors were adopted (see Journal fur Landwirtschaft, 

 1900,48:375-384). 



Second paragraph, second line, strike out the words "from three 

 to" ; third line, insert " in a weighing bottle" after the word "weighed." 



Page 26, under "(f) Method for estimating galactan", twelfth line, 

 strike out the word "gently", and for "on a water bath for fifteen 

 minutes" read "on a water bath at 80 C. for fifteen minutes with 

 constant stirring". 



Line 14, after the word "bath" insert "avoiding unnecessary heat- 

 ing, which causes decomposition". 



Line 19, for "a short time" substitute "three hours". 



ERRATA. 



Page 24, under "6. Determination of albuminoid nitrogen by 

 Stutzer's method, (a) Preparation of reagent", second line, for "25 

 cc" read" 2.5 cc". 



Page 26, top of page, in formulae I to VI, place minus sign between 

 word "furfural" and factor. 



