. The isolation of harmful organic substances from soils. decomposition of protein is shown bythe formation of pyridine on reduction of the melanoidins or huminsubstances, resulting from the dissociation of protein, as demonstratedby Hopkins and Coled have further shown that trypto-phane, one of the dissociation products of protein, is readily changedto dark-colored humin substances on boiling with acids, or even withwater, and Ellinger6 has suggested for tryptophane the structuralformula: Tryptophane. Kynurenic acid. H.,N-CH9 N=CH H . \ / . \ C C //\ / / S / HC C C HC
. The isolation of harmful organic substances from soils. decomposition of protein is shown bythe formation of pyridine on reduction of the melanoidins or huminsubstances, resulting from the dissociation of protein, as demonstratedby Hopkins and Coled have further shown that trypto-phane, one of the dissociation products of protein, is readily changedto dark-colored humin substances on boiling with acids, or even withwater, and Ellinger6 has suggested for tryptophane the structuralformula: Tryptophane. Kynurenic acid. H.,N-CH9 N=CH H . \ / . \ C C //\ / / S / HC C C HC I II II II - I HC C CH HC CH V V V H H H which, as is readily seen, contains the possibility of the pyridineclosure, as illustrated by its transformation into kynurenic acid. All «Rademaker, Med. Herald, 19, 107 (1887).bZeitsch. physiol. Chem., 42, 121 (1904).cHofmeisters Beitr., 2, 355 (1902).d Jour. Physiol., 27, 418 (1901); 29, 451 (1903).eZeitsch. physiol. Chem., 43, 325 (1904). Bui. 53, Bureau of Soils, U. S. Dept. of Agricultuie. Plate Fig. 1.—Crystals of Picoline Carboxylic Acid Obtained from Soils, Formedfrom a Dilute Aqueous Solution.
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