Is science a foil ? Indirect powers of the novelistic speech in Jules Verne's work

Despite its reputation, Jules Verne's novel is not so clear about relationship between Literature and Science. First, even if Hetzel leads the author to a didactic form, novels show faulty knowledges, problems of readability, pessimism against progress. Verne seems to play a double game, using science warrants and behaviour skills to build a new type of narrative ethos, different from the realistic model. In order to make his stories more attractive, Verne manipulates the reader to modify his feeling of the unbelievable. Instead of transmitting established knowledges, he likes to explore science blancks and frontiers : adventures of sciences take place in the "field of hypothesis". Finally, science seems to be, for him, the best way to renew novel empowerment.