"Second Sight: A Study of Natural and Induced Clairvoyance" by Sepharial is a scientific publication written in the early 20th century. The book aims to demystify clairvoyance, exploring both its natural development and induced practices. It addresses the nature of second sight and offers insights into the processes and conditions that can enhance this psychic faculty. The opening of the work presents an introduction to the subject of second sight, emphasizing its often misunderstood nature. Sepharial shares his intent to discuss the development of clairvoyance through personal insights and experiences, while acknowledging the historical and scientific context of the phenomenon. He aims to validate the complex interplay between perception and the psychic realm, suggesting the need for a structured approach to explore the potential of clairvoyance, particularly through the use of crystals and mirrors as tools to aid in this psychic exploration. (This is an automatically generated summary.)