Ixef I : Tugniwin n uɣanib seggas 1846. Tekcem deg umawal n tefrensist deg 1872. Deg useggas n 1887 tuɣal s yisem "tusna n uɣanib" (science de style). Deg L‟angleterre, d tamiḍrant n "uɣanib" (style), i yettwasemrasen s waṭas, ad naf Worcester yessufɣ-d deg 1846 "Treatise on style", akked H. Spencer "the philosophy of style" deg 1852.