Defoe was permitted to leave his prison upon condition that he should act in the secret service of the Government, and his work was that of an hireling writer unburdened by principle. When Harley was ejected he made himself useful to Godolphin; when Godolphin was dismissed he went back to Harley, and 'the spirit of the _Review_ changed abruptly.' A more useful man for the work he had undertaken could not be found. His dexterity, his boldness, his knowledge of men and of affairs, his readiness as a writer, and it must be added his unscrupulousness, fitted him admirably for services which had to be done in secret. Much that he did openly was deserving of high praise. He was tolerant in an intolerant age, he did his best to forward the Union of England and Scotland, his patriotic spirit was not feigned, his words are often weighty with wisdom, and it has been truly said, that 'his powerful advocacy was enlisted in favour of almost every practicable scheme of social improvement that came to the front in his time.'[51] With equal truth the writer adds that Defoe was 'a wonderful mixture of knave and patriot.' The knavery is seen to some extent in his method of workmanship as a man of letters. In _A True Relation of the Apparition of one Mrs. Veal[52] the next day after her Death to one Mrs. Bargrave at Canterbury, 8th September, 1705_ (1706) Defoe's art of mystification is skilfully practised. 'This relation,' he says in the Preface, 'is matter of fact, and attended with such circumstances as may induce any reasonable man to believe it. It was sent by a gentleman, a Justice of Peace at Maidstone, in Kent, and a very intelligent person, to his friend in London as it is here worded; which discourse is here attested by a very sober and understanding gentleman, who had it from his kinswoman who lives in Canterbury, within a few doors of the house in which the within-named Mrs. Bargrave lives ... and who positively assured him that the whole matter as it is related and laid down is really true, and what she herself had in the same words, as near as may be, from Mrs. Bargrave's own mouth.' In addition to this circumstantial statement, the veritable appearance of the ghostly lady is confirmed by the fact that she wore a scoured silk gown, newly made up, which, as Mrs. Bargrave told a friend, she felt and commended. 'Then Mrs. Watson cried out, "you have seen her indeed, for none knew but Mrs. Veal and myself that the gown was scoured."' The ghost came chiefly for the purpose of recommending Drelincourt's volume, _A Christian's Defence Against the Fear of Death_, then in its third edition. The fourth edition contained Mrs. Bargrave's story. 'I am unable to say,' Mr. Lee writes, 'when Defoe's "Apparition" became a necessary appendage to the book; but think, that since the eleventh edition, to the present time, Drelincourt has never been published without it.'