Generally, according to Dr. Petrie, the average of the smaller type of churches or oratories may be stated to be about 15 feet in length, and 10 feet in breadth, though they show no fixed similarity in regard to size.[82] "In the general plan," he observes, "of this class of buildings there was an equal uniformity. They had a single doorway, always placed in the centre of the west wall,[83] and were lighted by a single window placed in the centre of the east wall, and a stone altar usually, perhaps always, placed beneath this window."[84] In these leading architectural features (with an exception to which I shall immediately advert), the Inchcolm cell or oratory corresponds to the ancient cells or oratories existing in Ireland, and presents the same ancient style of masonry—the same splaying internally of the window which is so common in the ancient Irish churches, both large and small—and the same configuration of doorway which is seen in many of them, the opening forming it being narrower at the top than at the bottom.
Fig. 10. St. Senan's Oratory on Bishop's Island.
In the Inchcolm oratory there is one exception, as I have just stated, to the general type and features of the ancient Irish oratory. I allude to the position of the door, which is placed in the south side of the Inchcolm cell, instead of being placed, as usual, in the western gable of the building. But this position of the door in the south wall is not without example in ancient Irish oratories that still exist.[85] The door occupies in this respect the same position in the Inchcolm oratory as in an oratory on Bishop's Island upon the coast of Clare, the erection of which is traditionally ascribed to St. Senan, who lived in the sixth century. This oratory of St. Senan (says Mr. Wakeman) "measures 18 feet by 12; the walls are in thickness 2 feet 7 inches. The doorway, which occupies an unusual position in the south side, immediately adjoining the west end wall, is 6 feet in height, and 1 foot 10 inches wide at the top, 2 feet 4 inches at the bottom. The east window splays externally, and in this respect is probably unique in Ireland."[86][87] These peculiarities are shown in the accompanying woodcut, Fig. 10, taken from Mr. Wakeman's Handbook of Irish Antiquities.
The Irish ecclesiastics did not scruple to deviate from the established plans of their sacred buildings, when the necessities of individual cases required it. In the Firth of Forth west winds are the most prevalent of all; and sometimes the western blast is still as fierce and long continued as when of old it drove King Alexander on the shores of Inchcolm. The hermit's cell or oratory is placed on perhaps the most protected spot on the island; and yet it would have been scarcely habitable with an open window exposing its interior to the east, and with a door placed directly opposite it in the western gable. It has been rendered, however, much more fit for a human abode by the door being situated in the south wall; and the more so, because the ledge of rock against which the south-west corner of the building abuts, protects in a great degree this south door from the direct effects of the western storm. The building itself is narrower than the generality of the Irish oratories, but this was perhaps necessitated by another circumstance, for its breadth was probably determined by the immovable basaltic blocks lying on either side of it.
The head of the doorway in the Inchcolm oratory is, as pointed out in a preceding page, peculiar in this respect, that externally it is constructed on the principle of the radiating arch, whilst internally it is built on the principle of the horizontal arch. But in other early Irish ecclesiastical buildings in Scotland, as well as in Ireland, the external and internal aspect of the doorway is sometimes thus constructed on opposite principles. In the round tower, for example, of Abernethy, the head of the doorway externally is formed of a large single stone laid horizontally, and having a semicircular opening cut out of the lower side of the horizontal block; while the head of the doorway internally is constructed of separate stones on the plan of the radiating arch.
One striking circumstance in the Inchcolm oratory—viz., its vaulted or arched roof, has been already sufficiently described; and, in describing it, I have stated that the arch is of a pointed form. In many of the ancient Irish oratories the roof was of wood, and covered with rushes or shingles; and most of them had their walls even constructed of wood or oak, as the term duir-theach originally signifies. But apparently, though the generic name duir-theach still continued to be applied to them, some of them were constructed, from a very early period, entirely of stone; and of these the roofs were occasionally formed of the same material as the walls, and arched or vaulted, as in the Inchcolm oratory. In speaking of the construction of the primitive larger churches of Ireland, Dr. Petrie states, that their "roof appears to have been constructed generally of wood, even where their walls were of stone;" while in the oratories or primitive smaller stone churches, "the roofs (says he) generally appear to have been constructed of stone, their sides forming at the ridge a very acute angle."[88] The selection of the special materials of which both walls and roof were composed, was no doubt, in many cases, regulated and determined by the comparative facility or difficulty with which these materials were obtained. At no time, perhaps, did timber exist on Inchcolm that could have been used in constructing such a building; whilst plenty of stones fit for the purpose abounded on the island, and there was abundance of lime on the neighbouring shore. Stone-roofed oratories of a more complex and elaborate architectural character than that of Inchcolm still exist in Ireland, and of a supposed very early date. We have already found, for instance, Dr. Petrie stating that "we have every reason to believe" that the stone-roofed oratories known as St. Kevin's House at Glendalough, and St. Columba's House at Kells, "were erected by the persons whose names they bear,"[89] and consequently that they are as old as the sixth century. These two oratories, are, as it were, two storeyed buildings; for each consists of a lower and larger stone-arched or vaulted chamber below, and of another higher and smaller stone-arched or vaulted chamber or over-croft above. The old small stone-roofed church still standing at Killaloe, and the erection of which Dr. Petrie is[90] inclined to ascribe to St. Flannan in the seventh century[91] presents also in its structure this type of double stone-vault or arch, as shown in the following section of it by Mr. Fergusson.[92] When treating of the early Irish oratories, Mr. Fergusson observes, "One of the peculiarities of these churches is, that they were nearly all designed to have stone roofs, no wood being used in their construction. The section (Fig. 11) of the old church at Killaloe, belonging probably to the tenth century, will explain how this was generally managed. The nave was roofed with a tunnel-vault with a pointed one over it, on which the roofing slabs were laid." Mr. Fergusson adduces Cormac's Chapel on the Rock of Cashel, St. Kevin's House or Kitchen at Glendalough, which he thinks "may belong to the seventh century;" and St. Columba's House at Kells, "and several others in various parts of Ireland, as all displaying the same peculiarity" in the stone roofing.
Fig. 11. Section of St. Flannan's Church at Killaloe.
