. The isolation of harmful organic substances from soils. Fig. 1.—Wheat Seedlings Showing the Effect of Dihydroxystearic Acid from Soils. [1, saturated solution of dihydroxystearic acid; 2, control in pure distilled water.]. Fig. 2.—Wheat Seedlings Grown in Solutions of Dihydroxystearic Acid from Soils. [1, solution of dihydroxystearic acid, 200 parts per million; 2, 100 parts; 3, 50 parts; 4, 20parts; 5, control in pure distilled water.] EFFECT OF DIHYDROXYSTEARIC ACID. 49 Picoline () or methyl pyridine, was harmful to wheatplants, but only killed in the concentrations of 1,000 parts
. The isolation of harmful organic substances from soils. Fig. 1.—Wheat Seedlings Showing the Effect of Dihydroxystearic Acid from Soils. [1, saturated solution of dihydroxystearic acid; 2, control in pure distilled water.]. Fig. 2.—Wheat Seedlings Grown in Solutions of Dihydroxystearic Acid from Soils. [1, solution of dihydroxystearic acid, 200 parts per million; 2, 100 parts; 3, 50 parts; 4, 20parts; 5, control in pure distilled water.] EFFECT OF DIHYDROXYSTEARIC ACID. 49 Picoline () or methyl pyridine, was harmful to wheatplants, but only killed in the concentrations of 1,000 parts per million,and did not cause injury below 500 parts per million. The injuryseemed to be manifested by the tops more than by the roots, thusresembling the action of pyridine. Piperidine (C5HUN), or hexahydropyridine, is known to occur innature, for example, in the pepper plant, and forms the nucleus ofmany alkaloids. Solutions of piperidine killed and injured at a lowerconcentration than either pyridine or picoline. A sample of piper-idine that was neutralized with acetic acid proved to be more toxicthan the strongly alkaline piperidine itself. Piperidine seems to injurethe roots more severely than the tops. Quino
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