Title: On the absolute value of the most common species of wood employed as combustibles
Abstract: Pollen diagrams of the Likhvin Interglacial of the Russian Plain, the Mazovian I Interglacial of Poland, and the Holstein and Neede Interglacial periods of western Europe show striking resemblances. However, the floras of the southwestern and southern regions of Europe appear to be somewhat richer than those of the northeastern and eastern regions. Elements such as Vitis, Pterocarya, Juglans regia, Abies alba, Carpinus orientalis, Buxus, Taxus, Tilia tomentosa, and Osmunda claytoniana are absent in the more northerly and easterly regions of Europe.The analysis of the pollen diagrams suggests a difference in the composition of the vegetation of the above-mentioned regions. During the interglacial period spruce-forest formations dominated in the boundaries of the Russian Plain, while in the area of southern Byelorussia, Poland, western Germany, The Netherlands and Denmark pine-forest formations were spread.Coniferous forests did not disappear, not even during the period of climatic optimum, though at that time the participation of broad-leaved trees was significant.