THREE:A true movement of carriages is dependent upon the amount or wearing power of their bearing surface, how this surface is disposed in reference to the strain to be resisted, and the conditions under which the sliding surfaces move; that is, how kept in contact. The cutting strain which is to be mainly considered, falls usually at an angle of thirty to forty degrees downward toward the front, from the centre of the lathe. To resist such strain a flat top shear presents no surface at right angles to the strain; the bearings are all oblique, and not only this, but all horizontal strain falls on one side of the shear only; for this reason, flat top shears have to be made much heavier than would be required if the sum of their cross section could be employed to resist transverse strain. This difficulty can, however, be mainly obviated by numerous cross girts, which will be found in most lathe frames having flat tops.
FORE:It is generally a safe rule to assume that any custom long and uniformly followed by intelligent people is right; and, in the absence of that experimental knowledge which alone enables one to judge, it is safe to receive such customs, at least for a time, as being correct.
THREE:His analysis of individuality was the first step in this direction. We have seen that he treats definition as a process of gradual specification, beginning with the most general notions, and working down by successive differentiations to the most particular. Now, the completed conception is itself the integration of all these differences, the bond of union holding them together. Turning to an antithetical order of ideas, to the material substance of which bodies are composed, and its various transformations, we find him working out the same vein of thought. According to the Aristotelian chemistry, an ultimate indeterminate unknowable something clothes itself with one or other of the opposing attributes, dry and moist, hot and cold; and when two of these are combined, manifests itself to our senses as one of the four elements. The elements combine in a particular manner to form homogeneous animal tissues, and these again are united into heterogeneous organs, which together constitute the living body. Here, then, we have two analogous series of specificationsone conceptual and leading down from the abstract to the concrete, the other physical, and leading up from the vague, the simple, and the homogeneous, to the definite, the complex, and the heterogeneous. Aristotle embraces both processes under a single comprehensive generalisation. He describes each of them as the continuous conversion of a346 possibility into an actuality. For the sake of greater clearness, let us take the liberty of substituting modern scientific terms for his cumbrous and obsolete classifications. We shall then say that the general notion, living thing, contains under it the two less general notionsplant and animal. If we only know of any given object that it has life, there is implied the possibility of its being either the one or the other, but not both together. On determining it to be (say) an animal, we actualise one of the possibilities. But the actualisation is only relative, and immediately becomes the possibility of being either a vertebrate or an invertebrate animal. The actuality vertebrate becomes the possibility of viviparous or oviparous, and so on through successive differentiations until we come (say) to a man. Now let us begin at the material end. Here are a mass of molecules, which, in their actual state are only carbon, nitrogen, and so forth. But they are potential starch, gluten, water, or any other article of food that might be named; for under favourable conditions they will combine to form it. Once actualised as such, they are possible blood-cells; these are possible tissues; these, again, possible organs, and lastly we come to the consensus of vital functions, which is a man. What the raw material is to the finished product, that are the parts to the entire organism, the elements to the compound, the genus to the species, and such in its very widest sense is potency to realisation, δ?ναμι? to ?ντελ?χεια, throughout the universe of growth and decay.246It was natural that one who united a great intellect to a glowing temperament should turn his thoughts to poetry. Plato wrote a quantity of versesverse-making had become fashionable just thenbut wisely committed them to the flames on making the acquaintance of Socrates. It may well be doubted whether the author of the Phaedrus and the Symposium would ever have attained eminence in metrical composition, even had he lived in an age far more favourable to poetic inspiration than that which came after the flowering time of Attic art. It seems as if Plato, with all his fervour, fancy, and dramatic skill, lacked the most essential quality of a singer; his finest passages are on a level with the highest poetry, and yet they are separated from it by a chasm more easily felt than described. Aristotle, whom we think of as hard and dry and cold, sometimes comes much nearer to the true lyric cry. And, as if to mark out Platos style still more distinctly from every other, it is also deficient in oratorical power. The philosopher evidently thought that he could beat the rhetoricians on their own ground; if the Menexenus be genuine, he tried to do so and failed; and even without its191 testimony we are entitled to say as much on the strength of shorter attempts. We must even take leave to doubt whether dialogue, properly so called, was Platos forte. Where one speaker is placed at such a height above the others as Socrates, or the Eleatic Stranger, or the Athenian in the Laws, there cannot be any real conversation. The other interlocutors are good listeners, and serve to break the monotony of a continuous exposition by their expressions of assent or even by their occasional inability to follow the argument, but give no real help or stimulus. And when allowed to offer an opinion of their own, they, too, lapse into a monologue, addressed, as our silent trains of thought habitually are, to an imaginary auditor whose sympathy and support are necessary but are also secure. Yet if Platos style is neither exactly poetical, nor oratorical, nor conversational, it has affinities with each of these three varieties; it represents the common root from which they spring, and brings us, better than any other species of composition, into immediate contact with the mind of the writer. The Platonic Socrates has eyes like those of a portrait which follow us wherever we turn, and through which we can read his inmost soul, which is no other than the universal reason of humanity in the delighted surprise of its first awakening to self-conscious activity. The poet thinks and feels for us; the orator makes our thoughts and feelings his own, and then restores them to us in a concentrated form, receiving in vapour what he gives back in a flood. Plato removes every obstacle to the free development of our faculties; he teaches us by his own example how to think and to feel for ourselves. If Socrates personified philosophy, Plato has reproduced the personification in artistic form with such masterly effect that its influence has been extended through all ages and over the whole civilised world. This portrait stands as an intermediary between its original and the far-reaching effects indirectly due to his dialectic inspiration, like that universal soul which Plato himself has placed between192 the supreme artificer and the material world, that it might bring the fleeting contents of space and time into harmony with uncreated and everlasting ideas.
FORE:Balmayne knelt down there with one of the lamps in his hand. His face was not good to look upon. Leona Lalage watched him eagerly.Our survey of Platos first period is now complete; and we have to enter on the far more arduous task of tracing out the circumstances, impulses, and ideas by which all the scattered materials of Greek life, Greek art, and Greek thought were shaped into a new system and stamped with the impress of an imperishable genius. At the threshold of this second period the personality of Plato himself emerges into greater distinctness, and we have to consider what part it played in an evolution where universal tendencies and individual leanings were inseparably combined.
