Very often, large volumes were kept, into which were written compositions of all kinds, both prose and poetry, such as were thought worth preserving, copied from older books, and written in, one after another, till the volume was filled. Of all these old books of mixed compositions, the largest that remains to us is the Book of Leinster, which is kept in Trinity College in Dublin. It is an immense volume, all in the Irish language, written more than 750 years ago; and many of the pages are now almost black with age and very hard to make out. It contains a great number of pieces, some in prose and some in verse, and nearly all of them about Ireland--histories, accounts of battles and sieges, lives and adventures of great men, with many tales and stories of things that happened in this country in far distant ages. The Book of the Dun Cow is preserved in the Royal Irish Academy in Dublin. It is fifty years older than the Book of Leinster, but not so large; and it contains also a great number of tales, adventures, and histories, nearly all relating to Ireland, and all written in the Irish language. Its name was derived from the following circumstance:--St. Kieran of Clonmacnoise had a favourite brown cow, whose skin, when she died, he caused to be turned into parchment, of which a book was made. But this old book no longer exists: it was lost ages ago; and the present "Book of the Dun Cow" is only a copy of it. Three other great Irish books kept in Dublin are the Book of Lecan [Leckan], the Yellow Book of Lecan, and the Book of Ballymote. These contain much the same kind of matter as the Book of Leinster--with pieces mostly different however--but they are not nearly so old. The Speckled Book, which is also in Dublin, is nearly as large as the Book of Leinster, but not so old. It is mostly on religious matters, and contains a great number of Lives of Saints, Hymns, Sermons, portions of the Scriptures, and other such pieces. All these books are written with the greatest care, and in most beautiful penmanship. The six old books described above have been lately printed, in such a way as that the print resembles exactly the writing of the old books themselves. The printed volumes are now to be found in libraries in several parts of Ireland, as well as in England and the Continent; so that those desirous of studying them need not come to Dublin, as people had to do formerly. Many people are now eagerly studying these books and men often come to Ireland from France, Germany, Italy, Norway and Sweden, Russia, and other countries, in order to learn the Irish language so as to be able to read them. But this requires much study, even from those who know the Irish of the present day; for the language of those books is old and difficult.