Page 21, under "4. Determination of nitrogen," print the neutral 

 permanganate method [for the determination of available organic 

 nitrogen] as a provisional method : 



(K) NEUTRAL PERMANGANATE METHOD (PROVISIONAL). 



Into a 400 cc Griffin beaker, low form, weigh an amount of sample containing approxi- 

 mately 0.075 gram of nitrogen (samples containing material that has been treated with acid 

 should be washed on a 9 cm S. S. No. 595 filter to 200 cc and transferred, filter and all, to 

 beaker); digest this with 125 cc of permanganate of potash solution (16 grams of pure 

 KMnO 4 to 1,000 cc of water) in a steam or hot-water bath for thirty minutes. Have the 

 beaker let down well into the steam or hot water and keep closed with a cover glass, stirring 

 twice at intervals of ten minutes with a glass rod. At the expiration of the time remove 

 from bath, add 100 cc of cold water and filter through a heavy 15 cm folded filter. Wash 

 with cold water, small quantities at a time, till total filtrate amounts te-400 cc. Dry and 

 determine nitrogen in residue by Kjeldahl method. 



Nineteenth Convention, 1902, Bui. 73. 



It was earnestly urged by the referee that in reporting analyses of 

 complete fertilizers the amounts of nitrogen existing in the form of 

 nitrates, ammonia salts, and organic nitrogen be specifically stated. 



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



Page 21, under "4. Determination of nitrogen," change the first 

 two lines of the provisional neutral permanganate method (k) to read 

 as follows : 



Into a 300 cc low form Griffin beaker weigh 2 grams of the sample, if from a mixed fertil- 

 izer; if from concentrated material use a quantity containing approximately 0.075 gram of 

 nitrogen. 



Twenty-first Convention, 1904, Bui. 90, Cir. 20. 



Page 21, under "4. Determination of nitrogen," print the alkaline 

 permanganate method for the determination of available organic 

 nitrogen : 



(L) ALKALINE PERMANGANATE METHOD (PROVISIONAL). 



Weigh out an amount of sample containing 0.045 gram of organic nitrogen and transfer 

 to a 600 cc distillation flask. After connecting with condenser, to which the receiver con- 

 taining standard acid has been attached, digest with 100 cc of alkaline permanganate solu- 

 tion (16 grams of KMnO 4 and 150 grams of sodium hydrate, dissolved in water and made to 

 bulk of 1 liter) for thirty minutes below the boiling point. Then boil until 85 cc of distillate 

 is obtained. If the material shows a tendency to adhere to the sides of the flask, an occa- 

 sional gentle rotation is necessary during distillation. 



II. METHODS FOB THE ANALYSIS OF FOODS, a 

 Seventeenth Convention, 1900, Bui. 62. 



The terms "phloroglucol," "diresorcol," and " furfural" were 

 adopted. 



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

 pentosans by means of phloroglucin," alter the fifth line to read as 



a See also Cir. 7, Rev., 1902, for amended methods under this section. 



