Abstract
Chemicalanalyses of peat profiles are described. They demonstrate changes in peat composition at the different stages in the bog''s development from the minero-trophic conditions under whichf en peat was formed to ombrotrophic conditions under which Sphagnum- Eriophorum peat was formed. The peats of the eastern sector of the bog are shown to have been minerotrophic until a comparatively late stage in the bog''s development due to the surrounding topography allowing Phragmites to persist even till the present day. Increased silica and aluminum in the upper peat layers are discussed in terms of increased deposition brought about by the activities of man through deforestation and the production of open habitats.