An investigation into the changes in the wood components of a tree with time was carried out using different thermoanalytical techniques. Methods such as DSC, TG, TMA, thermomicroscopy and analytical pyrolysis (MS) contribute to a better understanding of how the main components, cellulose and lignin, vary with time and climatic effects. In this study, we have considered only the influence of the growth period on the changes in cellulose and lignin in horizontal cuts of the tree sample. For conclusive interpretation of the results, however, precise measurements in the vertical direction would also be required. This would also yield conclusions with respect to the effect of climatic changes on the cellulose and lignin content within the annual rings.