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FORE:(1.) Why does machinery involve so many cylindrical forms?��(2.) Why is it desirable to have separate feed gear for turning and screw cutting?��(3.) What is gained by the frictional starting gearing now applied to the finer class of lathes?��(4.) How may the alignment of a lathe be tested?��(5.) What kind of deviation with a lathe carriage will most affect the truth of work performed?��(6.) How may an oval hole be bored on a common slide lathe?��(7.) How can the angular [128] ways of a lathe and the corresponding grooves in a carriage be planed to fit without employing gauges?��(8.) Give the number of teeth in two wheels to cut a screw of ten threads, when a leading screw is four threads per inch?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 specifications��one 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 notions��plant 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.246

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FORE:CHAPTER XXV. CRANK-HAMMERS.

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FORE:After its temporary adoption by the Academy, Pythagoreanism had ceased to exist as an independent system, but continued to lead a sort of underground life in connexion with the Orphic and Dionysiac mysteries. When or where it reappeared under a philosophical form cannot be certainly determined. Zeller fixes on the beginning of the first century B.C. as the most probable date, and on Alexandria as the most probable scene of its renewed speculative activity.385 Some fifty years later, we find Pythagorean teachers in Rome, and traces of their influence are plainly discernible in the Augustan literature. Under its earliest form, the new system was an attempt to combine mathematical mysticism with principles borrowed from the Stoic and other philosophies; or perhaps it was simply a return to the poetical syncretism of Empedocles. Although composed of fire and air, the soul is declared to be immortal; and lessons of holiness are accompanied by an elaborate code of rules for ceremonial purification. The elder Sextius, from whom Seneca derived much of his ethical enthusiasm, probably belonged to this school. He taught a morality apparently identical with that of Stoicism in every point except the inculcation of abstinence from animal food.386 To this might be added the practice of nightly self-confession��an examination from the moral point of view of how one��s whole day has been spent,��were we certain that the Stoics did not originate it for themselves.387

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FORE:INTRODUCTION.

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