Biotrop Bulletin. This new Bulletin started with No. 1 in 1970, printed by Archipel, Bogor, a paper by Mr. M. Soerjani, ’Alang alang, Imperata cylindrica (L.) P.B. pattern of growth as related to its problem of control’. 88 pp., 18 fig., 18 tab. This served also as a Ph.D. thesis for the author (promotor Prof. Ir. O. Soemarwoto, at Gadjah Mada University, 29 Aug. 1970). It comprises a detailed autecological study, partly experimental, on the morphology, phytochemistry, etc., effects of the environment and behaviour under various treatments. A combination of mechanical and chemical treatment is advised for eradicating this noxious weed.