  the discourses and mathematical demonstrations relating to two new sciences (discorsi e dimostrazioni matematiche, intorno Ã  due nuove scienze), published in 1638 was galileo's final book and a scientific testament covering much of his work in physics over the preceding thirty years. after his dialogue concerning the two chief world systems, the roman inquisition had banned the publication of any of galileo's works, including any he might write in the future.. see galileo affair for further details. after the failure of his initial attempts to publish two new sciences in france, germany, and poland, it was published by lodewijk elzevir who was working in leiden, south holland, where the writ of the inquisition was of less consequence (see house of elzevir). discourses was written in a style similar to dialogues, in which three men (simplicio, sagredo, and salviati) discuss and debate the various questions galileo is seeking to answer. there is a notable change in the men, however; simplicio, in particular, is no longer quite as simple-minded and stubborn an aristotelian as his name implies. his arguments are representative of galileo's own early beliefs, as sagredo represents his middle period, and salviati proposes galileo's newest models. ==introduction== the book is divided into four days , each addressing different areas of physics. galileo dedicates two new sciences to lord count of noailles. thumb|figure 1 out of galileo's two new sciences in the first day section in the first day, galileo addressed topics that were discussed in aristotle's physics and also the aristotelian school mechanics. it also provides an introduction to the discussion of both of the new sciences. the likeness between the topics discussed, specific questions that are hypothesized, and the style and sources throughout give galileo the backbone to his first day. the first day introduces the speakers in the dialogue: salviati, sagredo, and simplicio, the same as in the [[dialogue concerning the two chi
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