This chapter analyzes the uses and appropriations of scientific discourse in Argentine magazines from the fin de siècle: a period in which literary modernism coincided with the development of spiritualisms that aspired to the status of science (or “occult sciences”) like Spiritism and Theosophy. The aim is to examine concrete examples that relativize the sharp division between science, art, and spiritualism in the culture of this period. The main sources explored are La Quincena. Revista de letras (1893–1899), Philadelphia (1898–1902), La Verdad (1905–1911), and Constancia (1890–1905). In addition, the chapter focuses on how the astonishing growth of science in Argentina, as well as the social legitimation of scientific discourses, influenced other fields, giving shape to new literary expressions, beliefs, and utopian projections that synthesized the material and the spiritual.