The appointment of a man without any diplomatic experience or high official knowledge to what was, in the circumstances of the moment, the most important position in the Ministry, might well, at any other period, have given occasion for remark. At this time, however, the Government was peculiarly constituted; its policy was dictated by Marshal de Noailles, who had no official position; and all that was required of the new Minister was not plans or policies of action, but the dutiful deference and docility of his predecessor. The eyes of Noailles would have opened widely could he have read some of the pages which the new Secretary had already devoted to the principles and conduct of French foreign policy. D'Argenson's ministry lasted rather more than two years, and came to a close in January 1747. The period was an eventful one; and our knowledge of it is derived from diplomatic correspondence in every capital in Europe. The evidence has been digested in several important works, notably the elaborate study in four volumes by the Duc de Broglie,[259] and the comprehensive monograph by M. Edgar Zevort. These works are valuable and authoritative, but their conclusiveness may be disputed. There are many suggestions with which any one who has made a close personal study of d'Argenson may find it difficult to agree; while the divergencies of detail, and sometimes of conclusion, between the two writers, the admirably chosen series of documents given by M. Zevort, and, above all, a careful acquaintance with d'Argenson's own Journal for ten years before, suggest the necessity and afford ample scope for some independent criticism. It would seem, indeed, that these works have been undertaken primarily with a view to the general history of France; and that no adequate effort has been made to determine d'Argenson's real share in the events for which he bears the official responsibility. There is only too good reason to know that in many critical conjunctures, the foreign policy of France was only pursued because the Foreign Minister was powerless to avert it. Indeed there is reasonable ground for suspecting that no pains have been spared in comprehending everything but the Marquis d'Argenson himself; and that, if the perusal of his official despatches had been illumined by the study of his unofficial memoirs, the character of his action might have been explained more naturally than by the suggestion of stupidity or confusion of mind.