Hugo Kołłątaj’s treatise On dreams, or my refl ections on the reveries of nighttime reveries (1796) is an attempt at analyzing and classifying various dream theories and at analyzing and interpreting his own dreams. He takes the rationalist view of dreams, which, following Aristotle’s naturalistic philosophy, Hippocrates’ humours and the modern mechanistic theories, looks for physiological, medical and mnemic explanations of this phenomenon. The aim of his article is to position Kołłątaj’s treatise, a notable product of the Polish Enlightenment, against the background of all these naturalistic theories as well as to identify the points where he shares their approach and those that are distinctly his own. What makes the comparison more complex is the cross-genre nature of the work: it combines the elements of a philosophical treatise on dreams, a catalogue of ‘curious dreams’ and an autobiographical essay.

The work presents the results of the studies of Co-Cr-Mo casting alloys used in the production of frame casts of removable dentures,

crowns and bridges in dental prosthetics. The studies were performed on four Co-Cr-Mo alloys of different contents of Mo, W and other

additives. Electrochemical tests were performed, which aimed at examining the corrosion resistance of the alloys and observing the alloy

structure after chronoamperometric tests with the potential in the area of the occurrence of the passive layer breakpoint. The alloy

microstructure images after chronoamperometric tests show the presence of non-uniformly distributed general corrosion. Moreover, a

project of cobalt alloy casting was elaborated using a ceramic mold casting. Additionally, analysis of the obtained microstructure was

performed. The microstructure of the examined alloys was of the dendrite type. This microstructure was chemically inhomogeneous and

consisted of an austenitic matrix formed by a solid cobalt solution and chromium in the core dendritic structure.