ONE:The systematising power of Aristotle, his faculty for bringing the isolated parts of a surface into co-ordination and continuity, is apparent even in those sciences with whose material truths he was utterly unacquainted. Apart from the falseness of their fundamental assumptions, his scientific treatises are, for their time, masterpieces of method. In this respect they far surpass his moral and metaphysical works, and they are also written in a much more vigorous style, occasionally even rising into eloquence. He evidently moves with much more assurance on the solid ground of external nature than in the cloudland of Platonic dialectics, or among the possibilities of an ideal morality. If, for example, we open his Physics, we shall find such notions as Causation, Infinity, Matter, Space, Time, Motion, and Force, for the first time in history separately discussed, defined, and made the foundation of natural philosophy. The treatise On the Heavens very properly regards the celestial movements as a purely mechanical problem, and strives throughout to bring theory and practice327 into complete agreement. While directly contradicting the truths of modern astronomy, it stands on the same ground with them; and anyone who had mastered it would be far better prepared to receive those truths than if he were only acquainted with such a work as Platos Timaeus. The remaining portions of Aristotles scientific encyclopaedia follow in perfect logical order, and correspond very nearly to Auguste Comtes classification, if, indeed, they did not directly or indirectly suggest it. We cannot, however, view the labours of Aristotle with unmixed satisfaction until he comes on to deal with the provinces of natural history, comparative anatomy, and comparative psychology. Here, as we have shown, the subject exactly suited the comprehensive observation and systematising formalism in which he excelled. Here, accordingly, not only the method but the matter of his teaching is good. In theorising about the causes of phenomena he was behind the best science of his age; in dissecting the phenomena themselves he was far before it. Of course very much of what he tells was learned at second-hand, and some of it is not authentic. But to collect such masses of information from the reports of uneducated hunters, fishermen, grooms, shepherds, beemasters, and the like, required an extraordinary power of putting pertinent questions, such as could only be acquired in the school of Socratic dialectic. Nor should we omit to notice the vivid intelligence which enabled even ordinary Greeks to supply him with the facts required for his generalisations. But some of his most important researches must be entirely original. For instance, he must have traced the development of the embryo chicken with his own eyes; and, here, we have it on good authority that his observations are remarkable for their accuracy, in a field where accuracy, according to Caspar Friedrich Wolff, is almost impossible.210
TWO:In addition to its system of intermediate duties, the Stoic ethics included a code of casuistry which, to judge by some recorded specimens, allowed a very startling latitude both to the ideal sage and to the ordinary citizen. Thus, if Sextus Empiricus is to be believed, the Stoics saw nothing objectionable about the trade of a courtesan.65 Chrysippus, like Socrates and Plato, denied that there was any harm in falsehoods if they were told with a good intention. Diogenes of Seleucia thought it permissible to pass bad money,66 and to30 sell defective articles without mentioning their faults;67 he was, however, contradicted on both points by another Stoic, Antipater. Still more discreditable were the opinions of Hecato, a disciple of Panaetius. He discussed the question whether a good man need or need not feed his slaves in a time of great scarcity, with an evident leaning towards the latter alternative; and also made it a matter of deliberation whether in case part of a ships cargo had to be thrown overboard, a valuable horse or a worthless slave should be the more readily sacrificed. His answer is not given; but that the point should ever have been mooted does not say much for the rigour of his principles or for the benevolence of his disposition.68 Most outrageous of all, from the Stoic point of view, is the declaration of Chrysippus that Heracleitus and Pherecydes would have done well to give up their wisdom, had they been able by so doing to get rid of their bodily infirmities at the same time.69 That overstrained theoretical severity should be accompanied by a corresponding laxity in practice is a phenomenon of frequent occurrence; but that this laxity should be exhibited so undisguisedly in the details of the theory itself, goes beyond anything quoted against the Jesuits by Pascal, and bears witness, after a fashion, to the extraordinary sincerity of Greek thought.70
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