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FORE:It may be said that the One is itself a mystical conception, involving a reversal of all our ordinary beliefs. The universe is a vast multiplicity of objects, held together, if you will, by some secret bond of union possibly related to the personal unity of consciousness, but still neither lost nor confused in its identity. Precisely; but Plotinus himself fully admits as much. His One is the cause of existence, not existence itself. He knows just as well as we do, that the abstract idea of unity has no reality apart from the mind. But if so, why should he associate it, in the true mystical style, with the transports of amorous passion? The question is pertinent, but it might be addressed to other Greek systems as well. We must remember that Plotinus is only commenting and enlarging on Plato. In the Republic also, the Idea of Good is described as transcending the existence and the knowledge which it produces,465 and in the Symposium, the absolute self beautiful, which seems to be the Good under another name, is spoken of in terms not less passionately enthusiastic than any applied by Plotinus to the vision of the One.466 Doubtless the practical sense of the great Attic master did not desert him even here: the object of all thought, in its widest sweep and in its highest flight, is to find room for every possible expansion of knowledge, for every possible elevation of life. Plotinus was a stranger to such broad views; but in departing from Plato, as usual he follows Aristotle. The absolute self-thinking thought of the Stagirite is, when we examine it closely, only one degree less chimerical than the Neo-Platonic unification. For it means consciousness of self without the314 correlative consciousness of a not-self, and as such, according to Aristotle, it affords an eternal felicity equal or superior to the best and happiest moments of our sensitive human life. What Plotinus does is to isolate personal identity from reason and, as such, to make it at once the cause and the supreme ideal of existence. This involves two errors: first a false abstraction of one subjective phenomenon from the sum total of conscious life; and, secondly, an illegitimate generalisation of this abstraction into an objective law of things. But in both errors, Aristotle had preceded him, by dissociating reason from all other mental functions, and by then attributing the whole cosmic movement to the love which this isolated faculty of reason, in its absolute self-existence, for ever inspires. And he also set the example of associating happiness, which is an emotional state, with an intellectual abstraction from which emotion is necessarily excluded.Attention has been called to this case as one wherein the conditions of operation obviously furnish true data to govern the arrangement of machinery, instead of the determinable strains to which the parts are subjected, and as a good example of the importance of studying mechanical conditions from a practical and experimental point of view. If the general diameter of a shaft is based upon the exact amount of power to be transmitted, or if the diameter of a shaft at various parts is based upon the torsional stress that would be sustained at these points, such a shaft would not only fail to meet the conditions of practical use, but would cost more by attempting such an adaptation. The regular working strain to which shafts are subjected is inversely as the speed at which they run. This becomes a strong reason in favour of arranging shafts to run at a maximum speed, provided there was nothing more than first cost to consider; but there are other and more important conditions to be taken into account, principal among which are the required rate of movement where power is taken off to machines, and the endurance of bearings.