In the fifteen years between my Essay on the Study of Literature and the first volume of the Decline and Fall, (1761-1776,) this criticism on Warburton, and some articles in the journal, were my sole publications. It is more especially incumbent on me to mark the employment, or to confess the waste of time, from my travels to my father's death, an interval in which I was not diverted by any professional duties from the labours and pleasures of a studious life. 1. As soon as I was released from the fruitless task of the Swiss revolutions, (1768,) I began gradually to advance from the wish to the hope, from the hope to the design, from the design to the execution, of my historical work, of whose limits and extent I had yet a very inadequate notion. The Classics, as low as Tacitus, the younger Pliny, and Juvenal, were my old and familiar companions. I insensibly plunged into the ocean of the Augustan history; and in the descending series I investigated, with my pen almost always in my hand, the original records, both Greek and Latin, from Dion Cassius to Ammianus Marcellinus, from the reign of Trajan to the last age of the Western Caesars. The subsidiary rays of medals, and inscriptions of geography and chronology, were thrown on their proper objects; and I applied the collections of Tillemont, whose inimitable accuracy almost assumes the character of genius, to fix and arrange within my reach the loose and scattered atoms of historical information. Through the darkness of the middle ages I explored my way in the Annals and Antiquities of Italy of the learned Muratori; and diligently compared them with the parallel or transverse lines of Sigonius and Maffei, Baronius and Pagi, till I almost grasped the ruins of Rome in the fourteenth century, without suspecting that this final chapter must be attained by the labour of six quartos and twenty years. Among the books which I purchased, the Theodocian Code, with the commentary of James Godefroy, must be gratefully remembered. I used it (and much I used it) as a work of history, rather than of jurisprudence: but in every light it may be considered as a full and capacious repository of the political state of the empire in the fourth and fifth centuries. As I believed, and as I still believe, that the propagation of the Gospel, and the triumph of the church, are inseparably connected with the decline of the Roman monarchy, I weighed the causes and effects of the revolution, and contrasted the narratives and apologies of the Christians themselves, with the glances of candour or enmity which the Pagans have cast on the rising sects, The Jewish and Heathen testimonies, as they are collected and illustrated by Dr. Lardner, directed, without superseding, my search of the originals; and in an ample dissertation on the miraculous darkness of the passion, I privately withdrew my conclusions from the silence of an unbelieving age. I have assembled the preparatory studies, directly or