called over the Saxons to assist them, when the latter perceiving their defenceless condition, turned round upon them, and made an easy conquest of this country. In the struggle which then took place, the churches were again destroyed, the priests were slain at the very altars,[4-*] and though the British Church was never annihilated, Paganism for a while became triumphant. Towards the end of the sixth century, when Christianity was again propagated in this country by Augustine, Mellitus, and other zealous monks, St. Gregory, the head of the Papal church, and the originator of this mission, wrote to Mellitus not to suffer the Heathen temples to be destroyed, but only the idols found within them. These, and such churches built by the Romans as were then, though in a dilapidated state, existing, may reasonably be supposed to have been the prototypes of the Christian churches afterwards erected in this country. In the early period of the empire the Romans imitated the Grecians in their buildings of magnitude and beauty, forming, however, a style of greater richness in detail, though less chaste in effect; and columns of the different orders, with their entablatures, were used to support and adorn their public structures: but in the fourth century, when the arts were declining, the style of architecture became debased, and the predominant features consisted of massive square piers or columns, without entablatures, from the imposts of which sprung arches of a semicircular form; and it was in rude imitation of this latter style that the Saxon churches were constructed. The Roman basilicas, or halls of justice, some of which were subsequently converted into churches, to which also their names were given, furnished the plan for the internal arrangement of churches of a large size, being divided in the interior by rows of columns. From this division the nave and aisles of a church were derived; and in the semicircular recess at the one end for the tribune, we perceive the origin of the apsis, or semicircular east end, which one of the Anglo-Saxon, and many of our ancient Norman churches still present.