[34] Connected with the museum were various endowments analogous to our professorships and fellowships of colleges; under the Ptolemies the head librarian, in after times the professor of rhetoric, held the highest post within this ancient university. The librarian was usually chief priest of one of the greatest gods, Isis, Osiris, or Serapis. [35] His appointment was for life, and lay at the disposal of the monarch. Thus the museum was essentially a court institution, and its _savants_ and _littérateurs_ were accomplished courtiers and men of the world. Learning being thus nursed as in a hot-bed, its products were rank, but neither hardy nor natural. They took the form of recondite mythological erudition, grammar and exegesis, and laborious imitation of the ancients. In science only was there a healthy spirit of research. Mathematics were splendidly represented by Euclid and Archimedes, Geography by Eratosthenes, Astronomy by Hipparchus; for these men, though not all residents in Alexandria, all gained their principles and method from study within her walls. To Aristarchus (fl. 180 B.C.) and his contemporaries we owe the final revision of the Greek classic texts; and the service thus done to scholarship and literature was incalculable. But the earlier Alexandrines seem to have been overwhelmed by the vastness of material at their command. Except in pastoral poetry, which in reality was not Alexandrine, [36] there was no creative talent shown for centuries. The true importance of Alexandria in the history of thought dates from Plotinus (about 200 A.D.), who first clearly taught that mystic philosophy which under the name of _Neoplatonism_, has had so enduring a fascination for the human spirit. It was not, however, for philosophy, science, or theology that the Romans went to Alexandria. It was for literary models which should less hopelessly defy imitation than those of old Greece, and for general views of life which should approve themselves to their growing enlightenment. These they found in the half-Greek, half-cosmopolitan culture which had there taken root and spread widely in the East. Even before Alexander's death there had been signs of the internal break-up of Hellenism, now that it had attained its perfect development. Out of Athens pure Hellenism had at no time been able to express itself successfully in literature. And even in Athens the burden of Atticism, if we may say so, seems to have become too great to bear. We see a desire to emancipate both thought and expression from the exquisite but confining proportions within which they had as yet moved. The student of Euripides observes a struggle, ineffectual it is true, but pregnant with meaning, against all that is most specially recognised as conservative and national. [37] He strives to pour new wine into old bottles; but in this case the bottles are too strong for him to burst. The Atticism which had guided and comprehended, now began to cramp development.