GENERAL. 

 Seventeenth Convention, 1900, Bui. 62. 



The secretary was instructed to place in the next revised edition of 

 the methods the latest revision of atomic weights of the American 

 Chemical Society. 



[Note by the Editor. In making this insertion it is to be noted 

 that all calculations occurring in the methods depending upon atomic 

 weights should be corrected throughout to agree with the new table ot 

 atomic weights as adopted.] 



I. METHODS FOB THE ANALYSIS OF FERTILIZERS. 



[All page references are to Bui. 46.] 

 Seventeenth Convention, 1900, Bui. 62. 



Page 13, under " (b) Optional volumetric method, (1) Preparation 

 of reagents," omit (6) and (c). 



Page 14, under " (2) Total phosphoric acid, (b) Determination," add 

 (b 2 )and(b 3 ): 



(b 2 ) Proceed as directed in (b t ), with this exception: Heat in water bath at 45 to 50, 

 add the molybdate solution, and allow to remain in the bath, with occasional stirring, for 

 thirty minutes. 



(b 3 ) Proceed as in (bj) to the point where the solution is ready to be placed in the water 

 bath. Then cool solution to room temperature, add molybdate solution at the rate of 75 

 cc for each decigram of phosphoric acid present, place flask containing solution in shaking 

 apparatus and shake for thirty minutes at room temperature, filter at once, wash, and titrate 

 as in preceding method. 



Eighteenth Convention, 1901, Bui. 67. 



Page 14, under "4. Determination of nitrogen, (a) Standard hydro- 

 chloric acid," the secretary is directed "to correct evident error." 



[Note by the Editor. From correspondence with the chairman of 

 the committee on recommendations who offered this motion it appears 

 that the following changes are desired to make the details of manipu- 

 lation more definite : 



On page 15, first line, for "Allow to cool somewhat, and then filter 

 through asbestos," read, "Allow to cool somewhat, and then filter in a 

 Gooch crucible through asbestos." 



For the first sentence of the second paragraph, " Put the capsule and 

 precipitate aside," etc., read as follows: "Put the vessel containing 

 the precipitate aside, remove the filtrate from the receiver and return 

 once through the Gooch crucible so as to obtain it quite clear, and set 

 aside to recover excess of silver."] 



(3) 



