The subject of this article is related to the previous one; it discusses a practical issue in detail. The author deals with the hedge, a type of enclosure. He discusses ways of planting hedges depending on their functions in defensive, protective, economic and decorative applications; in each case he gives appropriate shrub and tree species, with special emphasis on conifers.
The conifers prevail in 90 per cent in the forests of the Katowice province. These trees characterized by a low resistance to industrial pollution are susceptible to noxious insects. It is a heritage of the policy of the Prussian authorities from the period of an early capitalism when the forests were revived by planting new trees but only pines and spruces. The enormous pollution of the atmosphere in Silesia exerts an adverse effect not only on the overground portions of the trees but it also poisons their habitats. Next the extractive industry causes high disorders in hydrological relations.
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