It was shown by special experiments that there was no appreciable amount of substances in the samples that appeared at temperatures above 260°C. The amounts of the individual alkaloids calculated as percentages of the total are given in Table i. The main alkaloids of Peganum harmala L. growing in the basin of the R. Yagnob were harmine and deoxyvascisinone. The amount of harmine was highest in the green fruit and roots, and deoxyvascisinone was the main alkaloid of the epigeal part. The amount of peganine was higher in the ripe fruit. The alkaloid harmaline was not predominating in any part of the plant.