Between 1928 and approx. 1940, C.G. Jung built up a collection of over two hundred early printed books on alchemy. In his works he analyzed them from a psychological point of view. Thus arose one of the most complete private collections of its time in the field of alchemy. It also includes other rare works in related areas such as magic, mysticism and Kabbalah, along with ancient books of dreams and literature of the Church Fathers.