The Church of the Apostles is nearer this later type and has its unfortunate agglomeration of ill-placed towers, but St. Gereon is _sui generis_; it can hardly be said to have any plan at all, for it is made up of a simple little aisleless church of three bays with a round apse and two small transept-like towers, joined on to an irregular decagon of a nave, somewhat elliptical in plan, with large niches in each of the eight lateral sides and a square porch or narthex at the west end. This anomalous “nave” is early thirteenth century it is true, while the eastern church is one hundred and fifty years older, but the Gothic work is on foundations undoubtedly Roman and takes the place of a structure of somewhat similar plan built by the Empress Helena. The sequence is curious; there was first a circular or elliptical Roman building, on the foundations of which the Empress Helena built her church, the crypt of which still remains, then the easterly choir was built by Archbishop Hanno late in the eleventh century, and finally the original main church was torn down and rebuilt on Gothic lines about 1225. In nearly all the Romanesque churches of Cologne an attempt has been made to reproduce the original polychromatic decoration which once covered all portions of the masonry, but the results are not eminently satisfactory, for mechanical diaper and stencilling cannot take the place of the old work which was done freely and without exactness of line and spacing, while the colours and the medium used were quite different from what is employed to-day. There is no doubt that once every Gothic interior, now grey and sombre, or garish in its clean whitewash and mathematical jointing of painted lines, was entirely covered with the richest possible surface decoration in colours and gold, and the result must have been a gorgeousness and a gaiety of which we know nothing and that would probably shock our sensitive taste to the point of hysteria. One would like to see some great church with full colour decoration, but as matters now stand, with oil paint, stencils, coal-tar colours, and all that, the experiment could hardly be made with any degree of safety.