In the Hebrides the place-names Papa Stour, Papa Westray, and so forth are officially recognised as the seats of prehistoric padres, patricks, or papas. Skeat imagines that the words _pap_ meaning food, and _pap_ meaning teat or breast, are alike "of infantine origin due to the repetition of _pa pa_ in calling for food". They may be so, but to understand the childhood of the world one must stoop to infantile levels. In Celtic _alp_ or _ailpe_ meant _high_, and also _rock_. Among the ancients rock was a generally recognised symbol of the undecaying immutable High Father, and in seemingly every tongue will be found puns such as _pierre_ and _pere_, Peter the pater, and Petra the Rock. The papacy of Peter is founded traditionally upon St. Petra, the Rock of Ages, "Upon this Rock will I found my Church," and the St. Rock of this country, whose festival was celebrated upon Rock Monday, was assumedly a survival of pagan pre-Christian symbolism. [Illustration: FIG. 20.--From _Analysis of Ancient Mythology_ (Bryant, J.).] In the group of coins here illustrated it will be noticed that the _Mater Deorum_ is conventionally throned upon a rock. "Unto Thee will I cry, O Lord my Rock," wrote the Psalmist, and the inhabitants of Albion probably once harmonised in their ideas with the Kafirs of India, who still say of the stones they worship, "This stands for God, but we know not his shape." In Cornwall, within living memory, the Druidic stones were believed in some mysterious way to be sacred to existence, and the materialistic theory which attributes all primitive worship to fear or self-interest, will find it hard to account satisfactorily for stone worship. Cold, impassive stone, neither feeds, nor warms, nor clothes, yet, as Toland says: "'Tis certain that all nations meant by these stones without statues the eternal stability and power of the Deity, and that He could not be represented by any similitude, nor under any figure whatsoever". [Illustration: FIG. 21.--Christ and His Apostles, under the form of Lambs or of Sheep. (Latin sculpture; first centuries of the Church.) From _Christian Iconography_ (Didron).]