The collections of the PAN Kórnik Library include one of the most interesting illuminated manuscripts of “Digestum vetus” made at the request of Emperor Justinian. The manuscript is marked by a very rich iconographic programme including 25 figurative initials and more than 230 marginal illustrations. Both types of image excellently correlate with the text of the legal manuscript and the marginal illustrations constitute a visual commentary to it. The manuscript contains a commentary by Accursius (Glossa ordinaria) as well as many earlier pre-accursian glosses. The manuscript was brought to Poland by Dziersław of Karnice, a scholaster from Płock, in the 15th century. He purchased it during his stay in Italy, where he studied law from 1469 until 1471. The manuscript spent the next 300 years in Plock, in the library of the cathedral chapter. It was subsequently purchased by Tadeusz Czacki, who added it to the collections of the Poryck Library. After a few years, the manuscript was bought by Adam Jerzy Czartoryski, who made it a part of the collections of the Puławy Library. Finally, the manuscript was brought to the Kórnik Library founded by the Działyński family.
The substrates to biogas production in anaerobic digestion, except plant materials, can also be animal feces and manure. It should be highlighted that Poland is one of leaders in the European Union in animal breeding. However, there is no precise data in the literature on the potential of biogas production from animal feces in this country. The aim of the paper was to analyze the biogas production potential from manure in Poland. The aim of work included anaerobic digestion research following materials: cow manure, pig manure, poultry manure and sheep manure. In the next step, based on the obtained results of the biogas yield, energy potential calculations were made. The methane yield for the investigated feedstock materials in the batch culture technology was performed following the internal procedures developed based on the adapted standards, i.e. DIN 38 414-S8 and VDI 4630. Animal wastes were obtained from the Agricultural Experimental Stations of Poznan University of Life Sciences (Poznan, Poland). On a base of achieved results it was concluded that tested substrates have a high energy potential (approx. 28.52 GWh of electricity). The largest potential for electricity production was found in chicken manure (about 13.86 GWh) and cow manure (about 12.35 GWh). It was also shown which regions of Poland have the best chance for development of agriculture biogas plants (Wielkopolskie and Mazowieckie voivodships) and where the potential is the least (Lubuskie and Opolskie voivodeships).