The third volume of Water-in-Plants Bibl iography includes papers in al I fields of plant water relations research which appeared during the year 1977 - from theore­ tical considerations about the state of water in cel Is and its membrane transport to drought resistance of plants or physiological significance of irrigation. In addition to papers devoted entirely to plant water relations, papers on other topics are included if they contain data on plant hydration level, water vapour efflux, rate. of water uptake or water transport, etc., or if they contain valuable methodological information (measurement of selected microclimatic factors, soi I moisture, etc. l. We have tried to cover fully the relevant papers which have appeared in the important scientific periodicals and books. Articles published in local journals, mimeographed booklets, abstracts of thesis and of symposia contributions, etc., were chosen mostly from reprints received directly from authors. The courtesy of those authors who have already supplied us with reprints and lists of their publ ications is highly appreciated. The manuscript is usually prepared in May and June of the year fol lowing the year which it covers. Unfortunately some reprints come later and thus the respective references appear in the fol lowing volume, with one year delay. To maximize the value of the bibliography the references are arranged alphabe­ tical Iy according to the authors' names, and each volume is provided with three in~ dexes. The authors' index contains al I names of authors, co-authors and editors.