[Vapors: a historical approach]

This paper deals with the historical problem of "les Vapeurs". The word was largely used in ancient times, especially during the 18th century. The philosophical background goes back as far as Plato and Aristotle, but the turning point of the concept was given by a french scientist: B. Pomme. According his hypothesis "the nerves were shrinking because of drying" and the treatment had to be long, prolonged bathing. After being very fashionable, the treatment became obsolete and B. Pomme retired in his home city of Arles. This history of "les vapeurs" is of a great interest, because it shows how scientists are being easily abused by intellectual conceptions and words, only "words without meaning".