Now, of the general value of the abstract method and the legality of its employment in the sphere of history, this is perhaps not the suitable occasion for any discussion. It is, however, in all ways worthy of note that Polybius is not merely conscious of, but dwells with particular weight on, the fact which is usually urged as the strongest objection to the employment of the abstract method—I mean the conception of a society as a sort of human organism whose parts are indissolubly connected with one another and all affected when one member is in any way agitated. This conception of the organic nature of society appears first in Plato and Aristotle, who apply it to cities. Polybius, as his wont is, expands it to be a general characteristic of all history. It is an idea of the very highest importance, especially to a man like Polybius whose thoughts are continually turned towards the essential unity of history and the impossibility of isolation. Farther, as regards the particular method of investigating that group of phenomena obtained for him by the abstract method, he will adopt, he tells us, neither the purely deductive nor the purely inductive mode but the union of both. In other words, he formally adopts that method of analysis upon the importance of which I have dwelt before. And lastly, while, without doubt, enormous simplicity in the elements under consideration is the result of the employment of the abstract method, even within the limit thus obtained a certain selection must be made, and a selection involves a theory. For the facts of life cannot be tabulated with as great an ease as the colours of birds and insects can be tabulated. Now, Polybius points out that those phenomena particularly are to be dwelt on which may serve as a _παράδειγμα_ or sample, and show the character of the tendencies of the age as clearly as ‘a single drop from a full cask will be enough to disclose the nature of the whole contents.’ This recognition of the importance of single facts, not in themselves but because of the spirit they represent, is extremely scientific; for we know that from the single bone, or tooth even, the anatomist can recreate entirely the skeleton of the primeval horse, and the botanist tell the character of the flora and fauna of a district from a single specimen. Regarding truth as ‘the most divine thing in Nature,’ the very ‘eye and light of history without which it moves a blind thing,’ Polybius spared no pains in the acquisition of historical materials or in the study of the sciences of politics and war, which he considered were so essential to the training of the scientific historian, and the labour he took is mirrored in the many ways in which he criticises other authorities.