Theor. Appl. Genet. 57 (1980) Book Re~ews Folia Dendrologiea. Vol. 6 Bratislava, Vydavatelstvo Slovenskej Akad6mie Vied 1979. 180 pp. soft bound Kcs 20.00. The volume opens with an Address honoring Franti~ek Ben~at on the occasion of his 50th birthday, in Slovakian, Russian, German and English. The papers included are appropriate to his interests as one of Czechoslovakia's leading dendrologists. One discusses the observed and theoretical adaptation of Paulownia tomentosa to Slovakia, and a second describes native populations of Betula pubescens. Two papers describe morphological studies: one is general and methodological; the other is specific to stem-bark of Quercus cerris. Physiological studies of Pinus sylvestris pollen extracts, of endogenous gibberellins in seeds of Prunus laurocerasus and of leaf moisture-content in a Quercus-Carpinus-Acer stand are the topics of three papers. The eighth paper explores inter-specific compatibility in Salix. All except one of these have summaries in Russian, German and English and all except one is in Slovakian. The volume concludes with four honorific articles, plus seven book reviews. M. Vidakovic; W.J. Libby, Zagreb tion). Health effects caused by exposure to Hg via ingestion are given: lethal effects on aquatic life appear at concentrations of > 10, sublethal at > 3 for inorganic and > 0,1/~g/liter for organic ng. The review 'Organolead compounds: environmental health aspects' by P. Grandjean and T. Nielsen is dedicated to the problem of organolead compound production and to pollution by these compounds. There have been no adequate regulations eliminating environmental health hazards from these compounds. Environmental exposure to...