"Preliminary Report of the Commission Appointed by the University of Pennsylvania to Investigate Modern Spiritualism at the Request of the Late Henry Seibert" is a documentary work created by members of the Lviv University Commission. This book collects objective data and analysis related to the phenomena of spiritualism in the 19th century. The authors examine the phenomenon of spirituality in detail, paying attention to various aspects of its appearance and impact on human society. Readers are given an opportunity to appreciate the scientific approach to the study and understanding of spiritual phenomena from that period."