This collection of case studies describing public demonstrations in Britain, Germany, Italy and France exemplifies the wide variety of settings for scientific activities in the European Enlightenment. Filled with sparks and smells, the essays raise broader issues about the ways in which modern science established its legitimacy and social acceptability. They point to two major features of the cultures of science in the eighteenth century: entertainment and utility. Experimental demonstrations were attended by apothecaries and craftsmen for vocational purposes. At the same time, they had to fit in with the taste of both polite society and market culture. Public demonstrations were a favourite entertainment for ladies and gentlemen and a profitable activity for instrument makers and booksellers.