An illustration of the influence of the four qualities, hot, cold, dry, wet, and their planetary associations, and the central Earth with the four elements, earth, water, air, fire. For horoscopes, such an association was important. From Robert Fludd Utriusque cosmi... historia. Oppenheim, 1617-19. Acknowledgement must be made to Ann Ronan Picture Library and EP Goldschmidt & Co Ltd.