These passages owe their interest to the attestation of their sincerity by the writer's own practice. "Do not," he counsels one of his unknown correspondents, "take up a subject because it is singular and will get you credit, but because you _love_ it;" and he himself acted on the rule. Nothing more impresses the student of Carlyle's works than his _thoroughness._ He never took a task in hand without the determination to perform it to the utmost of his ability; consequently when he satisfied himself that he was master of his subject he satisfied his readers; but this mastery was only attained, as it is only attainable, by the most rigorous research. He seems to have written down his results with considerable fluency: the molten ore flowed freely forth, but the process of smelting was arduous. The most painful part of literary work is not the actual composition, but the accumulation of details, the wearisome compilation of facts, weighing of previous criticisms, the sifting of the grains of wheat from the bushels of chaff. This part of his task Carlyle performed with an admirable conscientiousness. His numerous letters applying for out-of-the-way books to buy or borrow, for every pamphlet throwing light on his subject, bear testimony to the careful exactitude which rarely permitted him to leave any record unread or any worthy opinion untested about any event of which or any person of whom he undertook to write. From Templand (1833) he applies for seven volumes of Beaumarchais, three of Bassompierre, the Memoirs of Abbe Georgel, and every attainable account of Cagliostro and the Countess de la Motte, to fuse into _The Diamond Necklace._ To write the essay on _Werner_ and the _German Playwrights_ he swam through seas of trash. He digested the whole of _Diderot_ for one review article. He seems to have read through _Jean Paul Richter,_ a feat to accomplish which Germans require a special dictionary. When engaged on the Civil War he routed up a whole shoal of obscure seventeenth-century papers from Yarmouth, the remnant of a yet larger heap, "read hundredweights of dreary books," and endured "a hundred Museum headaches." In grappling with _Friedrich_ he waded through so many gray historians that we can forgive his sweeping condemnation of their dulness. He visited all the scenes and places of which he meant to speak, from St. Ives to Prague, and explored the battlefields. Work done after this fashion seldom brings a swift return; but if it is utilised and made vivid by literary genius it has a claim to permanence. Bating a few instances where his sense of proportion is defective, or his eccentricity is in excess, Carlyle puts his ample material to artistic use; seldom making ostentation of detail, but skilfully concentrating, so that we read easily and readily recall what he has written. Almost everything he has done has made a mark: his best work in criticism is final, it does not require to be done again. He interests