A very well written book, a fair comment on a time ridiculed by the "Enlightenment" who had pitched in a rather cartoonish portrait. No, we had not fallen back to prehistory after experiencing Rome and its supremacy and successive invasions of conquering tribes from the East. The author presents an expanding civilization, with its thirst for knowledge, his discoveries, his mode of operation (women, for example, with rights that she will recover ... twentieth century). An expansion in France to whom we owe what we are.