one who studies and resolves cases of conscience. The Jesuit Escobar has made a collection of the opinions of all the casuists before him. M. le Fèvre, preceptor of Louis XIII., called the books of the casuists expositions of the "art of quibbling with God." Mayer has published a Bibliotheca of Casuists, divided into three heads—Lutheran, Calvinist, and Romish.—(See Jeremy Taylor's *Ductor Dubitantium.*)