But the inscribed clay tablets, countless in number and infinitely various in size, shape and contents, far outweigh in importance all other kinds of cuneiform inscriptions in existence. A detailed treatment of the latter would far exceed the necessary limits of this little volume, but a few words may be said regarding the main classes of tablets discovered. Their size and shape are sometimes indicative of the period to which they belong, sometimes of the subject-matter with which they deal. A very early type is represented by those found below the level of Ur-Ninâ’s building at Tellô; the tablets in question which have not been baked in an oven, and are round in form, deal with the sale and purchase of land. Similar round tablets were found by the German excavators at Fâra, which were however baked and not sun-dried. The same rounded baked clay tablets were evidently in vogue at the time of Bur-Sin, for several have been brought to light which are dated in his reign, and contain details regarding certain landed property. But the commonest type of clay tablet is that characterized by its rectangular shape, sometimes square, but more frequently oblong, and varying greatly in size. The tablets in the Kouyunjik collection, which represents the largest, and in one sense the only Assyrian library as yet discovered, vary from one to fifteen inches in length when complete, many of them being made from the very finest clay. The writing is sometimes exceedingly minute, though marvellously clear and sharp, and is more or less stereotyped in character. Astrology, astronomy, history, mythology, magic, medicine, mathematics, prayers, hymns, lists of gods, omens, lexicography and grammar are all well represented in this famous library. Many of the texts are copies of older Babylonian literature made by Ashur-bani-pal’s scribes, and stored away in the royal archives. Some of the texts are bilingual, the top line containing the Sumerian ideographic version, and the lower line giving the Assyrian translation, and these bilingual inscriptions together with the syllabaries have enabled scholars to unravel and elucidate at all events to some extent the old Sumerian language.