Of the later Stoics there were many more who could be named as having been famous. More distinguished in science than Cleanthes was his disciple, Chrysippus of Cilicia, born Ol. 125, 1 (474 A.U.C.; 280 B.C.), who likewise lived in Athens, and who was specially active in promoting the wide cultivation and extension of the philosophy of the Stoics. His logic and dialectic were what contributed most largely to his fame, and hence it was said that if the gods made use of dialectic, they would use none other than that of Chrysippus. His literary activity is likewise admired, for the number of his works, as Diogenes Laërtius tells us, amounted to seven hundred and five. It is said of him in this regard that he wrote five hundred lines every day. But the manner in which his writings were composed detracts very much from our wonder at this facility in writing, and shows that most of his works consisted of compilations and repetitions. He often wrote over again respecting the very same thing; whatever occurred to him he put down on paper, dragging in a great variety of evidence. Thus he quoted almost entire books by other writers; and someone gave expression to the belief that if all that belonged to others were taken away from his books, only white paper would be left. But of course it is not so bad as all this, as we may see by all the quotations from the Stoics, where the name of Chrysippus is placed at the head, as it always is, and his conclusions and explanations are used by preference. His writings, of which Diogenes Laërtius mentions a long list, have, however, all been lost to us; so much is nevertheless correct, that he was the main constructor of the Stoic logic. While it is to be regretted that some of his best works have not come down to us, it is, perhaps, a good thing that all are not preserved; if we had to choose between having all or none, the decision would be a hard one. He died in the 143rd Olympiad (212 B.C.).[123] In the period immediately following, Diogenes of Seleucia in Babylonia is a distinguished figure; Carneades, the celebrated Academic, is said to have learned dialectic from him, and he is also noteworthy because with this Carneades and Critolaus, a Peripatetic thinker, in Olympiad 156, 2 (598 A.U.C., or 156 B.C.) and in the time of the elder Cato, he was sent as Athenian ambassador to Rome—an embassy which first caused the Romans to make acquaintance with Greek philosophy, dialectic and rhetoric, in Rome itself. For those philosophers there gave lectures and discourses.[124] Besides these, Panaetius is well known as having been Cicero’s instructor; the latter wrote his treatise, _De Officiis_, after Panaetius. Finally, we have Posidonius, another equally famous teacher, who lived for long in Rome in the time of Cicero.[125]