From 1907 he was a member of the Warsaw Scientific Society. He wrote several textbooks, including: "Differential diagnosis of internal diseases" (1891), "Lectures on acute infectious diseases" (1900-1901), "General issues in the theory of medical sciences" (1897), "Logic of medicine" (1894, supplemented in 1908 and published as the "Logic of medicine, i.e. the principles of general methodology of medical sciences," in 1909 in Germany). He published in "Medical Review, News and Medicine." As a philosopher, he devoted himself to the theory of knowledge and the origin of morality. Biegański described his views as previsit. His greatest philosophical works are: "The Principles of General Logic" (1903), "Theory of Logic" (1912), "The Treatise on Knowledge and Truth" (1910), "Theory of Knowledge from the Position of the Principle of Purpose" (1914–1915), "Previsitism and Pragmatism", "Manual of Logic for High Schools and self-taught" (1906), and "General Ethics" (posthumously, 1918). From 1885, he was married to Mieczysława Rozenfeldówna, the daughter of engineer Henryk Rozenfeld. He died of angina and was buried in Kule cemetery in Częstochowa. By resolution of 4 November 2016, the Sejm of the Republic of Poland established 2017 as the Year of Władysław Biegański.