Christianity but in the native learning which was the main, and almost the sole, influence in developing it. This consideration points clearly to the conclusion that native learning was carefully and systematically cultivated before the introduction of Christianity. Again, Irish poetry owes its development solely to the Lay Schools.[17] It had complicated prosody—with numerous technical terms[18] all derived from the Irish language. These vernacular terms used in Irish grammar contrast strikingly with the terms used to designate the offices and ceremonies of Christianity which were almost all derived from Latin.[19] All this would go to prove that Irish prosodial rules and technical terms, and of course Irish poetry itself, were fully developed before the introduction of Christianity. FOREIGN TESTIMONY: At least one foreign writer bears witness of the fact that the pagan Irish possessed books. A Christian philosopher of the fourth century (some would place him as early as the second or third) whose name is Aethicus of Istria wrote a Cosmography of the World in which he states that on leaving Spain he hastened to Ireland where he spent some time “examining their books” (_eorum volumina volvens_).[20] Aethicus is not by any means complimentary. He calls the Irish sages unskilled and uncultivated teachers, but he speaks of the Spaniards in a similar strain. Possibly not understanding the Irish language he regarded all learning outside of Greece and Rome as barbarous and beneath notice. However, his statement proves that when he visited Ireland there were books at least a century before St. Patrick’s advent; it also shows that he found them in such abundance that he spent some time in examining them. OGAM INSCRIPTIONS: The point has now been reached when it is necessary to discuss the kind of writing used in pagan times. As has been stated, none of the books of pre-Christian Ireland are now extant, so evidence as to the kind of writing in use must be sought elsewhere. In the absence of books the coinage of a country has often given valuable information in this connection. In the case of Ireland, however, this source of information is lacking; for though metals were worked from very early times and gold was plentiful no trace of a native coinage has been found. Luckily there remain in the stone inscriptions the clearest proofs that the ancient Irish practised a peculiar kind of writing called Ogam. DESCRIPTION OF OGAM: Ogam or Ogham was a species of writing the letters of which were a combination of short lines and points on, and at both sides of, a middle or stem line called a _flesc_. In the specimens still remaining this Ogam writing is almost entirely confined to stone inscriptions, the groups of lines and points running along two adjacent sides of a stone with the angular edge for the _flesc_. The arrangement may be understood from a simple diagram.[21] [Illustration: