This article deals with two debates at two different moments in history: the recent 2004 debate on a law proposed by the Chirac government that aimed at forbidding any religious signs (including the Islamic headscarf) worn in an ostensible way at school; and the 1892 debate on native education in Algeria and the opportunity to have a Koran teacher at school. At stake in both debates were two conceptions of Republican laïcité (secularism), one assimilationist, the other more pragmatic.