The diggings at Nippur furnished indications that certain inscriptions found on that site and written in a very archaic form of script were to be assigned to a period earlier than that of Sargon. One class of evidence was obtained from a careful study of the different levels at which the inscriptions and the remains of buildings were found. At a comparatively deep level in the mound inscriptions of Sargon himself were recovered, along with bricks stamped with the name of Narâm-Sin, his son. It was, therefore, a reasonable conclusion roughly to date the particular stratum in which these objects were found to the period of the empire established by Sargon, with its centre at Agade. Later on excavations were carried to a lower level, and remains of buildings were discovered which appeared to belong to a still earlier period of civilization. An altar was found standing in a small enclosure surrounded by a kind of curb. Near by were two immense clay vases which appeared to have been placed on a ramp or inclined plane leading up to the altar, and remains were also found of a massive brick building in which was an arch of brick. No inscriptions were actually found at this level, but in the upper level assigned to Sargon were a number of texts which might very probably be assigned to the pre-Sargonic period. None of these were complete, and they had the appearance of having been intentionally broken into small fragments. There was therefore something to be said for the theory that they might have been inscribed by the builders of the construction in the lowest levels of the mound, and that they were destroyed and scattered by some conqueror who had laid their city in ruins. But all such evidence derived from noting the levels at which inscriptions are found is in its nature extremely uncertain and liable to many different interpretations, especially if the strata show signs of having been disturbed. Where a pavement or building is still intact, with the inscribed bricks of the builder remaining in their original positions, conclusions may be confidently drawn with regard to the age of the building and its relative antiquity to the strata above and below it. But the strata in the lowest levels at Nippur, as we have seen, were not in this condition, and such evidence as they furnished could only be accepted if confirmed by independent data. Such confirmation was to be found by examination of the early inscriptions themselves.