M. Lévy-Bruhl then explains that, whilst recognising the entire coherence of Comte’s collective labours, he proposes to confine his present study to the earlier and principal work, the Philosophy, which in M. Lévy-Bruhl’s opinion is the dominant and more fruitful composition.

This he regards as the representative work of the nineteenth century, as shown by the intellectual history of the period. He points to its influence on thought in England, in Europe, and in America. It will surpris...