The folder contains letters written to Lajos Jánossy, Gertrud Bortstieber's son. In these letters, Bortstieber writes at length about her own work, while also detailing the life and work of her husband, of her son Ferenc, and of her daughter Anna. She congratulates Lajos for his successful work and doctoral defense in Berlin. In two of these letters, Lukács shares his view on various philosophical aspects of natural phenomena.