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ONE:This work, as already explained, is to be devoted to mechanical engineering, and in view of the difference of opinion that exists as to what mechanical engineering comprehends, and the different sense in which the term is applied, it will be proper to explain what is meant by it here.

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Isometrical perspective is often useful in drawing, especially in wood structures, when the material is of rectangular section, and disposed at right angles, as in machine frames. One isometrical view, which can be made nearly as quickly as a true elevation, will show all the parts, and may be figured for dimensions the same as plane views. True perspective, although rarely necessary in mechanical drawing, may be studied with advantage in connection with geometry; it will often lead to the explanation of problems in isometric drawing, and will also assist in free-hand lines that have sometimes to be made to show parts of machinery oblique to the regular planes. Thus far the remarks on draughting have been confined to manipulation mainly. As a branch of engineering work, draughting must depend mainly on special knowledge, and is not capable of being learned or practised upon general principles or rules. It is therefore impossible to give a learner much aid by searching after principles to guide him; the few propositions that follow comprehend nearly all that may be explained in words."You used to lock it up in the yard here. We find a fresh cake of blacklead in the scullery, which completely puzzled me for a little time. When I heard about the autocar I knew. But we are getting away from the point. When luck turned against you it did so completely. You got into Isidore's rooms, only to find Mr. Charlton there, who was waiting for him. Again fortune favoured us. Mr. Charlton gave the alarm, and you had to fly. At length the motor was abandoned, and its secret disclosed. You disappeared. Sooner or later I was certain of seeing you again."It will now be better understood whence arose the hostility of the Stoics to pleasure, and how they could speak of it in what seems such a paradoxical style. It was subjective feeling as opposed to objective law; it was relative, particular, and individual, as opposed to their formal standard of right; and it was continually drawing men away from their true nature by acting as a temptation to vice. Thus, probably for the last reason, Cleanthes could speak of pleasure as contrary to Nature; while less rigorous authorities regarded it as absolutely indifferent, being a consequence of natural actions, not an essential element in their performance. And when their opponents pointed to the universal desire for pleasure as a proof that it was the natural end of animated beings, the Stoics answered that what Nature had in view was not pleasure at all, but the preservation of life itself.48That Philos interpretation of Platonism ultimately reacted on Greek thought seems certain, but at what date his influence began to tell, and how far it reached, must remain undecided. Plutarch speaks of Gods purity and of his transcendent elevation above the universe in language closely resembling that of the Alexandrian Jew, with whose opinions he may have been indirectly acquainted.400 We have already seen how the daemons were employed to fill up the interval thus created, and what serious concessions to popular superstition the belief in their activity involved. Still Plutarch259 does not go so far as to say that the world was not created by God. This step was taken by Numenius, a philosopher who flourished about the middle of the second century, and who represents the complete identification of Platonism with Pythagoreanism, already mentioned as characteristic of the period following that date. Numenius is acquainted with Philos speculations, and accepts his derivation of Platonism from the Pentateuch. What, he asks, is Plato but a Moses writing in the Attic dialect?401 He also accepts the theory that the world was created by a single intermediate agent, whom, however, he credits with a much more distinct and independent personality than Philo could see his way to admitting. And he regards the human soul as a fallen spirit whose life on earth is the consequence of its own sinful desires. From such fancies there was but a single step to the more thorough-going dualism which looks on the material world as entirely evil, and as the creation of a blind or malevolent power. This step had already been taken by Gnosticism. The system so called summed up in itself, more completely, perhaps, than any other, all the convergent or conflicting ideas of the age. Greek mythology and Greek philosophy, Zoroastrianism, Judaism, and Christianity each contributed an element to the fantastic and complicated scheme propounded by its last great representative, Valentinus. This teacher pitches his conception of the supreme God even higher than Philo, and places him, like Platos absolute Good, outside the sphere of being. From himor itas from a bottomless gulf proceed a vast series of emanations ending in the Demiurgus or creator of the visible world, whose action is described, in language vividly recalling the speculations of certain modern metaphysicians, as an enormous blunder. For, according to Gnosticism, the world is not merely infected with evil by participation in a material principle, it is evil altogether, and a special intervention of260 the higher powers is needed in order to undo the work of its delirious author.402 Here we have a particular side of Platos philosophy exaggerated and distorted by contact with Zoroastrian dualism. In the Statesman there is a mythical description of two alternate cycles, in one of which the world is governed by a wise providence, while in the other things are abandoned to themselves, and move in a direction the reverse of that originally imposed on them. It is in the latter cycle that Plato supposes us to be moving at present.403 Again, after having been long content to explain the origin of evil by the resistance of inert matter to the informing power of ideal goodness, Plato goes a step further in his latest work, the Laws, and hazards the hypothesis of an evil soul actively counterworking the beneficent designs of God.404 And we find the same idea subsequently taken up by Plutarch, who sees in it the most efficient means for exonerating God from all share in the responsibility for physical disorder and moral wrong.405 But both master and disciple restricted the influence of their supposed evil soul within very narrow limits, and they would have repudiated with horror such a notion as that the whole visible world is a product of folly or of sin.
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