Contributors. Foreword. Preface. Profile of John L. Harper. Scientific Publications of John L. Harper Dynamics and Evolution of Plant Populations in Natural or Seminatural Environments: Past, Present and Future: Studies on the Population Dynamics of Some Long-lived Trees, J. Ogden. Plant Demography: A Community-level Interpretation, J. Sarukhán, D. Pinero and M. Martinez-Ramos. Fires and Emus: The Population Ecology of Some Woody Plants in Arid Australia, J.C. Nobel. Differences in Life Histories between Two Ecotypes of Plantago lanceolata L., J.M. van Groenendael. Variation and Differentiation in Population of Trifolium repens in Permanent Pastures, . Disasters and Catastrophies in Populations of Halimione portulacoides, Ad H.L. Huiskes and A.W. Stienstra. Establishment and Peri-establishment Mortality, R.E.L. Naylor. Population Biology and the Conservation of Rare Species, H.J. Harvey. Biology of Invasive and Weedy Species: Invading Plants: Their Potential Contribution to Population Biology, R.N. Mack. Proso Millet (Panicum miliaceum L.): A Crop and a Weed, P.B. Cavers and M.A. Bough. Population Dynamics of a Few Exotic Weeds in North-east India, R.S. Tripathi. Weeds and Agriculture: A Question of Balance, B.R. Trenbath. The Demographic Interpretation of Plant Form: Application to Plant Competition and Production: On the Astogeny of Six-cornered Clones: An Aspect of Modular Construction, A.D. Bell. The Importance of Plant form as a Determining Factor in Competition and Habitat Exploitation, P.H. Lovell and P.J. Lovell. Modular Demography and Form in Silver Birch, M. Jones. Modular Demography and Growth Patterns of Two Annual Weeds (Chenopodium album L. and Spergula arvenis L.) in Relation to Flowering, L. Maillette. A Modular Approach to Tree Production, M. Franco. Plant Interference: The Effects of Neighbours: Plant Responses to Crowding, A.R. Watkinson. The Thinning Rule and Its Application to Mixtures of Plant Populations, J. White. The Influence of Pathogens and Predators on Plant Populations: Pathogens and the Genetic Structure of Plant Populations, J.J. Burdon. Sex Ratios, Clonal Growth and Herbivory in Rumex acetosella, J.L. Doust and L.L. Doust. The Role of Grazing Animal, R. Dirzo. Plant Reproductive Biology: Islands and Dioecism: Insights from the Reproductive Ecology of Pandanus tectorius in Polynesia, P.A. Cox. The Meaning and Measurement of Reproductive Effort in Plants, F.A. Bazzaz and E.G. Reekie. Index.