A wannan lokacin, ba za a iya auna saurin haske daidai ba don yanke shawarar wane ka'idar ce daidai. Na farko da ya yi daidai daidai shine Léon Foucault, a 1850. Sakamakonsa ya goyi bayan ka'idar ka'idar ka'idar, kuma an watsar da ka'idar kwayar halitta ta gargajiya, kawai don sake fitowa a cikin karni na 20. Tambaya: Menene ka'idar game da sauri?
haske