The skin: Histology, composition, chemistry of proteins in the skin, kinds of animals - origin, skinning, processes of conservation, valuation of the quality of skins, defects of rawhides; Tanning agents: Chemistry and reactions of tanning materials; Processes of leatherproduction: tannery machines, different kinds of leather, application, methods for leathertesting; Ecology: Byproducts of leatherproduction - avoidance, utilization, deposition, amount of sewage, composition, treatment, treatment of waste air, technologies for avoidance; Economy: examples of the Austrian leatherproduction