TWO:Two precepts stand out before all others, which, trivial as they may seem, are uttered from the very soul of Greek62 experience, Be moderate, and, Know thyself. Their joint observance constitutes the characteristic virtue of S?phrosyn, which means all that we understand by temperance, and a great deal more besides; so much, in fact, that very clever Greeks were hard set to define it, and very wise Greeks could pray for it as the fairest gift of the gods.48 Let us suppose that each individual has a sphere of activity marked out for him by his own nature and his special environment; then to discern clearly the limits of that sphere and to keep within them would be S?phrosyn, while the discernment, taken alone, would be wisdom. The same self-restraint operating as a check on interference with other spheres would be justice; while the expansive force by which a man fills up his entire sphere and guards it against aggressions may be called courage. Thus we are enabled to comprehend the many-sided significance of S?phrosyn, to see how it could stand both for a particular virtue and for all virtuousness whatever. We need only glance at Homers poems, and in particular at the Iliada much deeper as well as a more brilliant work than the Odysseyto perceive how very early this demand for moderation combined with self-knowledge had embodied itself in Greek thought. Agamemnon violates the rights of Achilles under the influence of immoderate passion, and through ignorance of how little we can accomplish without the heros assistance. Achilles, again, carries his vindictiveness too far, and suffers in consequence. But his self-knowledge is absolutely perfect; conscious that he is first in the field while others are better in council, he never undertakes a task to which his powers are not fully adequate; nor does he enter on his final work of vengeance without a clear consciousness of the speedy death which its completion will entail on himself. Hector, too, notwithstanding ominous forebodings, knows his duty and does it, but with much less just an estimate of his own powers, leading him to pursue his success too far, and then, when the63 tide has turned, not permitting him to make a timely retreat within the walls of Troy. So with the secondary characters. Patroclus also oversteps the limits of moderation, and pays the penalty with his life. Diomed silently bears the unmerited rebuke of Agamemnon, but afterwards recalls it at a most effective moment, when rising to oppose the craven counsels of the great king. This the Greeks called observing opportunity, and opportunism was with them, as with French politicians, a form of moderation.49 Down at the very bottom of the scale Thersites and Dolon are signal examples of men who do not know their sphere and suffer for their folly. In the Odyssey, Odysseus is a nearly perfect type of wisdom joined with self-control, erring, if we remember rightly, only once, when he insults Polyphemus before the ship is out of danger; while his comrades perish from want of these same gifts.There is, however, a principle in hydraulic machinery that must be taken into account, in comparing it with positively geared mechanism, which often leads to loss of power that in many cases will overbalance any gain derived from the peculiar action of hydraulic apparatus. I allude to the loss of power incident to dealing with an inelastic medium, where the amount of force expended is constant, regardless of the resistance offered. A hydraulic crane, for instance, consumes power in proportion to its movements, and not as the amount of duty performed; it takes the same quantity of water to fill the cylinders of such cranes, whether the water exert much or little force in moving the pistons. The difference between employing elastic mediums like air and steam, and an inelastic medium like water, for transmitting force in performing irregular duty, has been already alluded to, and forms a very interesting study for a student in mechanics, leading, as it does, to the solution of many problems concerning the use and effect of power.
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