123 



Potas h results reported by cooperating chemists. 



HI I t-r mi u-.-l 



' Ufsiilts received too late to be included in the averages. 



COMMENTS BY ANALYSTS. 



/ / linker, Gene xi. V ) Moist filter paper pulp was used in one of each set of 

 (lupin-ait-.-" ami a thick pad of asbestos in the other, with no appreciable variation in 

 results. In some cases the precipitate showed a tendency to run through the filter 

 paper pulp. It was easier, however, to wash the filter paper free from acid. Cor- 

 rertions were made fur a blank of 0.3 cc of potassium hydroxid. Corrections were 

 to mad*- for blanks in the official method. You will notice that in the case of the 

 mixed fertili/er the two methods differ by about 0.4 of a per cent. During a series 

 of determinations I was unable to obtain any closer agreement. 



E. C. Carlyle, College Station, Tex.: The use of pulped filter paper for filtering the 

 phosphomolybdate is found satisfactory and it reduces the bumping when the liquid 

 is heated for the purpose of dissolving the potash salt. 



G. S. Farnham, Cincinnati, Ohio: I regret to report that I failed to get checks for 

 the volumetric method. 



P. Rudnick, Chicago, III.: It seems from the results by the official method that 

 there is some truth in the claim that the method for mixed fertilizers when applied 

 to sulphate of potash gives somewhat lower results, The proposed volumetric method 



