Ecology of water pollution in Pasig River I. Physico-chemical water quality parameters / M. Tamayo-Zafaralla and P.E. Sajise -- Growth of barley and wheat seedlings in compact soil with 2,4-D and ioxynil / A.A. Alejar -- Peroxidase isozymes in the mutant (Makapuno) and normal endosperms of coconut / C.V. Mujer and D.A. Ramirez -- Sporangial morphology of drynarioid ferns / S. Chandra -- On the identity of Sika in Palawan, Philippines / J. Dransfield -- Seed germination and seedling growth of Diospyros melanoxylon with growth regulators / Lalman and A. Misra -- Intrusive growth in the phloem of Cassia / M. Yunus and D. Yunus -- ystematic studies of Philippine cheyletid mites (Acarina). III. Polycheyletus batangenius (Corpuz-Raros), comb. nov. / L.A. Corpuz-Raros -- Chemotaxonomic studies in Plectocomia (Palmae: Lepidocaryoideae) / D.A. Madulid -- Gray leaf spot of tomato in the Philippines / R.B. Valdez and N.L. Opina -- Influence of soil moisture tension on survival of rhizobia / E.S. Paterno and S.N. Tilo -- Correlation of vascular bundle and panicle characters in rice / E.S. Paterno and S.N. Tilo -- Correlation of vascular bundle and panicle characters in rice / N. Joarder and A.M. Eunus -- A review of the literature on marine turtles in the Philippines / E.D. Gomez -- Haploplegma duperreyi and Dasyphila plumarioides (Ceramiaceae, Rhodophyta) from Boracay Island, Aklan / J.T. Berdach -- Dinitrogen fixation in the root nodules of Elaeagnus philippensi / R.B. Aspiras, H.C. Miranda Jr., R.C. Pabale, and W.L. Barraquio -- Cases of abnormal coloration in three Philippine birds / L.S. Cuy

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