His ground-breaking studies and scientific publications influenced the next generations of Polish naturalists and have laid down foundations of malacology.

He sold a significant portion of the family estate during January Uprising and donated twice large sums of money to the cause.

[1] In 1840 he took a couple years of field practice on his family estate in Truskałowo before continuing education under watchful eye of Carl Sprengel at the Regenwalde Akademie der Landwirtschaft (Academy of Agriculture in Resko), where – partially thanks to Felicjan's notes and observations – Sprengel formulated his "Theorem of minimum" (commonly known as "Liebig's law", because it was Justus von Liebig who later popularized this theorem and was mistakenly attributed its authorship).

After finishing his education, he settled and worked in Skoraszewice, Piotrowo, Pempowo and Sypniewo (all within his family's vast estate at that time), where he worked on natural history in general, and published multiple studies and expertises in entomology, malacology and algology, as well as occasional medical and philosophical treatises, among many others.

He collected and properly preserved (using his own-devised process) more than 10,000 specimens of butterflies and spiders alone, some of which are the only existing examples of species considered extinct today.