Edward Bellamy 
Dr. Heidenhoff’s Process [PDF ebook] 

This early novel from the author of the socialist utopian tale Looking Backwards is another classic of the nineteenth-century science fiction and fantasy genre. The ‘process’ in the book’s title refers to a procedure that removes painful or unwanted memories and allows lovers who have been through difficult romantic entanglements to forget selected portions of the past and move forward. However, as is often the case with scientific breakthroughs, there are unanticipated twists and turns in the story. A must-read for fans of early science fiction.