The Middle Ages 55 



the Middle Ages left luminescence information in the same condi- 

 tion as during classic times. In the fifteenth and sixteenth centuries, 

 noted for reawakening in all branches of learning and for voyages 

 of discovery, a number of new luminous animals were to be added 

 to the known list. The great naturalists were to describe and classify 

 all living things, but knowledge of inorganic luminescence of solid 

 bodies was to remain barren until 1603. 



