The first chapter deals with the extraction, phytochemical screening and acute toxicity studies of the ethanol and chloroform extracts of Polyalthia longifolia leaves. The second chapter deals with the in vitro antioxidant activity of the extracts. Chapter three covers the in vitro xanthine oxidase inhibitory activity. In the fourth chapter, details of the inhibition exhibited against 12-lipoxygenase enzyme is provided.The anti-cataractogenesis activity was studied using goat lens and the details are dealt in the fifth chapter. The in vitro alpha amylase and alpha glucosidase enzyme...