The beautifully illustrated article in the _Studio_ for Aug. 15, 1898, by J. Romilly Allen, F.S.A., shows the whole line. In the earliest form of Irish cross, _i.e._ that where the cross and Christian symbols are merely cut into the face of a slab of stone, such as in the cross at Reask, Co. Kerry, we see precisely the primitive style of art shown in the Catacombs. The "Gurmarc" stones have their prototype in the earliest Longobardic carving, such as the _pluteus_ of Theodolinda's first church at Monza. The smaller of the three inscribed circles has an even more advanced Comacine _intreccio_ enclosed within the circle, while the cross of Honelt at Llantwit Major (Fig. 5) has a splendid Comacine knot such as one sees on every Longobardic church, placed beneath a very Byzantine geometrical design in which circles, crosses, triangles, and three-fold knots are marvellously intermingled. These are all stones merely incised, and foreshadow the predilection of the Irish converts for the symbolism of the time, the cross of Christ within the unending circle of eternity. The next development shown by Mr. Romilly Allen is the upright cross slab at St. Madoes in Perthshire, where the cross and the circle are in distinct relief and not merely incised. Here, instead of the circle enclosing the Greek cross, it has become subordinate, and is placed behind the arms of a Latin cross. In fact a complete Irish cross in relief. But how is it adorned?--with splendid Comacine _intrecci_, and all the symbolism so familiar to us in early Italian art. Here are the coiled serpent and the dove above, with the four mystic beasts of the Apocalypse below, two on each side of the stem of the cross; and the workmanship and designs are literally identical with those of the sculptures on the façades of the first church of S. Michele at Pavia, and S. Zeno at Verona, and that of S. Pietro at Spoleto, all of the fifth and sixth centuries. (Spoleto church was rebuilt in 1329, but the ancient Lombard sculptures around the doorway were preserved.) [Illustration: DOOR OF THE CHURCH OF S. ZENO AT VERONA. A.D. 1139. _See page 166._]