William D. Hamilton’s Brazilian lectures and his unpublished model regarding Wynne-Edwards’s idea of group selection. With a note on pluralism and different “philosophical” approach to evolution

I examine some of the meanings of the concept of harmony and its use in relation to the idea of nature. The historical analysis allows us to advance an hypothesis: many theoretical and experimental arguments seem to disprove the existence of a universal harmony; however, the “social imaginary” from which this idea takes movement has an important role in the “intellectual construction” of nature.