It may be seen from the materials presented that quite a lot has been written on the theory of conservation in Poland, and that formulated theses have been applied to practice. The first works were devoted to conservation of architecture, and especially to the problems of rebuilding, then to mobile monuments. The subjects considered are concerned with all the most essential problems of conservation: individual treatment of works of art, limited and documented restoration of damage, considered intervention in the processes of the destruction of monuments, treating the work of art as a document with the full realization of given conditions, the role of conservation, its range and possibilities, and the position of the conservator in executing procedures. The present paper does not mention all who wrote on the subject of theory of conservation but only the more important authors whose opinions have most influenced conservation practice in Poland. -- AATA