The Stoics had a tremendous reputation for logic. In this department they were the successors or rather the supersessors of Aristotle. For after the death of Theophrastus the library of the Lyceum is said to have been buried underground at Scepsis until about a century before Christ, So that the Organon may actually have been lost to the world during that period. At all events under Strato the successor of Theophrastus who specialized in natural science the school had lost its comprehensiveness. Cicero even finds it consonant with dramatic propriety to make Cato charge the later Peripatetics with ignorance of logic! On the other hand Chrysippus became so famous for his logic as to create a general impression that if there were a logic among the gods it would be no other than the Chrysippean. But if the Stoics were strong in logic they were weak in rhetoric. This strength and weakness were characteristic of the school at all periods. Cato is the only Roman Stoic to whom Cicero accords the praise of real eloquence. In the dying accents of the school as we hear them in Marcus Aurelius the imperial sage counts it a thing to be thankful for that he had learnt to abstain from rhetoric, poetic, and elegance of diction. The reader however cannot help wishing that he had taken some means to diminish the crabbedness of his style. If a lesson were wanted in the importance of sacrificing to the Graces it might be found in the fact that the early Stoic writers despite their logical subtlety have all perished and that their remains have to be sought for so largely in the pages of Cicero. In speaking of logic as one of the three departments of philosophy we must bear in mind that the term was one of much wider meaning than it is with us. It included rhetoric, poetic, and grammar as well as dialectic or logic proper, to say nothing of disquisitions on the senses and the intellect which we should now refer to psychology. Logic as a whole being divided into rhetoric and dialectic: rhetoric was defined to be the knowledge of how to speak well in expository discourses and dialectic as the knowledge of how to argue rightly in matters of question and answer. Both rhetoric and dialectic were spoken of by the Stoics as virtues for they divided virtue in its most generic sense in the same way as they divided philosophy into physical, ethical, and logical. Rhetoric and dialectic were thus the two species of logical virtue. Zeno expressed their difference by comparing rhetoric to the palm and dialectic to the fist.