Seven bases were isolated from the bark of Hortia arborea Engl. Four of these are of the furoquinoline type; dictamine, γ-fagarine, nor-γ-fagarine and skimmianine. The remaining three are of the quinazoline group: rutecarpine and two new alkaloids, hortiamine and hortiacine. Hortiamine, a red alkaloid, C20H17N3O2, yields 6-methoxy-1-oxo-1,2,3,4-tetrahydropyrid [3,4-b]indole and N-methylanthranilic acid when heated with ethanolic potassium hydroxide. The alkaloid was resynthesized through condensation of these degradation products. It is 10-methoxy-14-methyl-5-oxo-5,7,8,14-tetrahydroindolo [2,3-c]quinazo [3,2-a]pyridine. Hortiamine undergoes hydration in aqueous solvents to form a crystalline yellow compound, C20H19N3O3, which is 2-(o-methylaminobenzoyl)-6-methoxy-1-oxo-1,2,3,4-tetrahydropyrid [3,4-b]indole (6-methoxyrhetsinine). The hydrochloride of the alkaloid evolves gas upon fusion to yield a base, C19H13N3O2 identical with the second new alkaloid, hortiacine, which is shown to be 10-methoxyrutecarpine.