In , Etienne Gilson presented for the the basic encyclicals of Leo XIII arranged in the order expressly indicated by the Pope himself. Gilson's sparkling introduction provides the proper perspective for the encyclicals; his notes brilliantly clarify obscure points; his summaries provide an immediate grasp of each encyclical; and his study of the variant translations is invaluable. In short, here is the definitive collection of the most important and far-reaching papal pronouncements of the modern age.