Physically many cats are able to get pregnant as young as only six or seven months old. However, it is better and healthier for pregnancy to occur when they're a little older. Often younger cats are not good mothers; the maternal instinct seems to be better developed when they're one year or older.
Initially, all modern linguistics was historical in orientation. Even the study of modern dialects involved looking at their origins. Ferdinand de Saussure 's distinction between synchronic and diachronic linguistics is fundamental to the present day organization of the discipline.
Periodization. Early history. Modern history. Recent attempts. Contemporary pedagogic periodization. bibliography. bibliography. Periodization attempts to impart significance to the passage of time in history by identifying and ordering chronological sequences (periods). As practiced by historians, it has a long and varied history; as a subject of study, it commands neither a formal body of knowledge nor systematic instruction. To the historian, although not to the archeologist or anthropologist, periodization serves no accepted theoretical function.