Which major work did Auguste Comte publish between 1851 and 1854?

Between 1851 and 1854, the French philosopher Auguste Comte published his four-volume major work titled Système de politique positive (System of Positive Polity).12

In this work, Comte completed his formulation of sociology, emphasizing morality and moral progress as the central focus of human knowledge and effort. He also outlined his vision for an ideal positivist society, which included a "religion of humanity" and a social structure guided by a secular priesthood of sociologists.23