Table 2 
In vitro inhibition by drugs of the deamination of tryptamine 
by mouse brain MAO 
Drug ECso(M) 
Harmine 8.0 x 10° 
Harmaline 6.0 x 10° 
Tetrahydroharmine 1.4.x 10° 
6-MeO-THC 5.8 xX 10° 
6-MeO-Harmane 3.1 x 10° 
6-MeO-Harmalane 1.8 x 10° 
6-MeO-Tetrahydroharmane 4.2x 10° 
and related compounds alone in other snuffs, justifies, however, 
the statement made in 1967 and quoted above and should 
encourage further research on this interesting group of indige- 
nous drugs and the plants from which they are derived. 
Species indicated in the foregoing discussion: 
Compsoneura Ulei Warburg in Verh. Bot. Ver. Prov. Brand. 47(1905) 136. 
Iryanthera coriacea Ducke in Journ. Wash. Acad. Sci. 26(1936)218. 
Iryanthera macrophylla (Bth.) Warburg in Nova Acta Acad. Leop.-Carol. 
68(1897)155. 
Iryanthera Ulei Warburg in Verh. Bot. Ver. Prov. Brand. 47(1905)137. 
Mpristica fragrans Houtt., Handleid 2(1774)333. 
Osteophloeum platyspermum (A.DC.) Warburg in Nova Acta Acad. Leop.- 
Carol. 68(1897)162. 
Virola calophylla Warburg in Nova Acta Acad. Leop.-Carol. 68(1897)231. 
Virola calophylloidea Markgraf in Repert. Sp. Nov. 19(1923)24. 
Virola carinata (Spr. ex Bth.) Warburg in Nova Acta Acad. Leop.-Carol. 
68(1897)222. 
Virola cuspidata (Spr. ex Bth.) Warburg in Nova Acta Acad. Leop.-Carol. 
68(1897)176. 
Virola divergens Ducke in Journ. Wash. Acad. Sci. 26(1936)255. 
Virola elongaia (Spr. ex Bth.) Warburg in Ber. Deutsch. Bot. Gesel. 13 
(1895)89. 
Virola loretensis A. C. Sm. in Bull. Torr. Bot. Club 60(1933)95. 
Virola Melinonii (Benoist) A. C. Sm. in Brittonia 2(1937)502. 
Virola multinervia Ducke in Journ. Wash. Acad. Sci. 26(1936)261. 
Virola Pavonis (DC.) A. C. Sm. in Brittonia 2(1937)504. 
Virola peruviana (A.DC.) Warburg in Nova Acta Acad. Leop.-Carol. 68 
(1897)188. 
Virola rufula Warburg in Nova Acta Acad. Leop.-Carol. 68(1897)181. 
Virola sebifera Aublet PI. Guian. Fr. 2(1775)904. 
Zoe 
