1) At the beginning of vegetation, the total alkaloids in the epigeal part of Veratrum lobelianum is 2.5% of the weight of the dry raw material, and at the end of vegetation, 0.036%. 2) The new alkaloids veralosine, veralosinine, and veralosidine have been isolated from the epigeal part of the plant. 3) On the basis of a study of chemical properties, IR, UV, NMR, and mass spectra, and also its conversion into tetrahydrosolasodine, structure and configuration I has been proposed as the most probable for veralosidine. © 1973 Consultants Bureau.