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URING the past four years the writer has done a great D deal of work on this method,' and the results obtained in this laboratory for the past two years, at least, by five analysts, I Bul. 43 and47, pp. 68-104 and 62-83, Chem. Div., U . S. Department of Agriculture ; Bul. 119, North Carolina Experiment Station : and this Journal, 16and 17, Nos. IT and 1%.doi:10.1021/ja02083a003 fatcat:ppe6ruyr4jaqvajsng4v5unffu