1920. The author intended this work as a primer of psychical research, an introduction to the subject, for those who have not as yet read extensively upon it. He endeavored to make clear why it is that the study of this subject is so important, and why it may in truth be called The Coming Science. Воспроизведено в оригинальной авторской орфографии издания 1920 года (издательство "Boston : Small, Maynard & company"). Это и многое другое вы найдете в книге The Coming Science