The dehydrogenation of lycopodine with selenium has yielded a mixture of five bases, two of which have been identified as 7-methyl-quinoline and 5:7-dimethyl-quinoline respectively. Heating the alkaloid with palladium on barium sulphate or with phthalic anhydride also yields 7-methyl-quinoline. It is concluded that the quinoline nucleus, completely hydrogenated, is present as such in lycopodine. The oxygen may be present as a cyclic ether.