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FORE:Previous to his forty-ninth year, Plotinus wrote nothing. At that age he began to compose short essays on subjects which suggested themselves in the course of his oral teaching. During the next ten years, he produced twenty-one such278 papers, some of them only a page or two in length. At the end of that period, he made the acquaintance of his future editor and biographer, Porphyry, a young student of Semitic extraction, whose original name was Malchus. The two soon became fast friends; and whatever speculative differences at first divided them were quickly removed by an amicable controversy between Porphyry and another disciple named Amelius, which resulted in the unreserved adhesion of the former to the doctrine of their common master.415 The literary activity of Plotinus seems to have been powerfully stimulated by association with the more methodical mind of Porphyry. During the five years416 of their personal intercourse he produced nineteen essays, amounting altogether to three times the bulk of the former series. Eight shorter pieces followed during the period of failing health which preceded his death, Porphyry being at that time absent in Sicily, whither he had retired when suffering from the fit of depression already mentioned.In their theory of cognition the Stoics chiefly followed Aristotle; only with them the doctrine of empiricism is enunciated so distinctly as to be placed beyond the reach of misinterpretation. The mind is at first a tabula rasa, and all our ideas are derived exclusively from the senses.37 But while knowledge as a whole rests on sense, the validity of each particular sense-perception must be determined by an appeal to reason, in other words, to the totality of our acquired experience.38 So also the first principles of reasoning are not to be postulated, with Aristotle, as immediately and unconditionally certain; they are to be assumed as hypothetically true and gradually tested by the consequences deducible from them.39 Both principles well illustrate the synthetic method of the Stoics��their habit of bringing into close16 connexion whatever Aristotle had studiously held apart. And we must maintain, in opposition to the German critics, that their method marks a real advance on his. It ought at any rate to find more favour with the experiential school of modern science, with those who hold that the highest mathematical and physical laws are proved, not by the impossibility of conceiving their contradictories, but by their close agreement with all the facts accessible to our observation. FORE: FORE:"At the present moment I could not swear to my own," Bruce said helplessly."A word with you, Dr. Bruce," he said. "These notes, 190753 to 190792, were in the possession of the man found murdered at the corner house in Raven Street. We know they were stolen from him. The next day they were paid here in purchase of some furniture."