Ecstasy: A Study of Happiness：http://www.gutenberg.org/files/37770/37770-h/37770-h.htm The Twilight of Souls: http://www.gutenberg.org/files/34458/34458-h/34458-h.htm Dr. Adriaan: http://www.gutenberg.org/files/34761/34761-h/34761-h.htm