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TWO:Closely connected with the materialism of the Stoics, and equally adverse to the principles of Plato and Aristotle, was their fatalism. In opposition to this, Plotinus proceeds to develop the spiritualistic doctrine of free-will.438 In the previous discussion, we had to notice how closely his arguments resemble those employed by more modern controversialists. We have here to point out no less wide a difference between the two. Instead of presenting free-will as a fact of consciousness which is itself irreconcilable with the dependence of mental on material changes, our philosopher, conversely, infers that the soul must be free both from the conditions of mechanical causation and from the general interdependence of natural forces, because it is an individual substance.439 In truth, the phenomena of volition were handled by the ancient philosophers with a vagueness and a feebleness offering the most singular contrast to their powerful and discriminating grasp of other psychological problems. Of necessarianism, in the modern sense, they had no idea. Aristotle failed to see that, quite apart from external restraints, our choice may conceivably be determined with the utmost rigour by an internal motive; nor could he understand that the circumstances which make a man responsible for his actions do not amount to a release of his conduct from the law of universal causation. In this respect, Plato saw somewhat deeper than his disciple, but created298 fresh confusion by identifying freedom with the supremacy of reason over irrational desire.440 Plotinus generally adopts the Platonist point of view. According to this, the soul is free when she is extricated from the bonds of matter, and determined solely by the conditions of her spiritual existence. Thus virtue is not so much free as identical with freedom; while, contrariwise, vice means enslavement to the affections of the body, and therefore comes under the domain of material causation.441 Yet, again, in criticising the fatalistic theories which represent human actions as entirely predetermined by divine providence, he protests against the ascription of so much that is evil to so good a source, and insists that at least the bad actions of men are due to their own free choice.442In no other branch of machinery has so much research and experiment been made during eighty years past as in steam machinery, and, strange to say, the greater part of this research has been directed to the details of engines; yet there has been no improvement made during the time which has effected any considerable saving of heat or expense. The steam-engines of fifty years ago, considered as steam-using machines, utilised nearly the same proportion of the energy or power developed by the boiler as the most improved engines of modern construction��a fact that in itself indicates that an engine is not the vital part of steam machinery. There is not the least doubt that if the efforts to improve steam-engines had been mainly directed to economising heat and increasing the evaporative power of boilers, much more would have been accomplished with the same amount of research. This remark, however, does not apply to the present day, when the principles of steam-power are so well understood, and when heat is recognised as the proper element to deal with in attempts to diminish the expense of power. There is, of course, various degrees of economy in steam-using as well as in steam-generating machinery; but so long as the best steam machinery does not utilise but one-tenth or one-fifteenth part of the heat represented in the fuel burned, there need be no question as to the point where improvements in such machinery should be mainly directed.