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TWO:A pair of spring calipers will illustrate this principle. The points are always steady, because the spring acting continually in one direction compensates the loose play that may be in the screw. In a train of tooth wheels there is always more or less play between the teeth; and unless the wheels always revolve in one direction, and have some constant resistance offered to their motion, 'backlash' or irregular movement will take place; but if there is some constant and uniform resistance such as a spring would impart, a train of wheels will transmit the slightest motion throughout.There is one more aspect deserving our attention, under which the theory of Nature has been presented both in ancient and modern times. A dialogue which, whether rightly or wrongly attributed to Plato, may be taken as good evidence on the subject it relates to,65 exhibits Hippias in the character of a universal genius, who can not only teach every science and practise every kind of literary composition, but has also manufactured all the clothes and other articles about his person. Here we have precisely the sort of versatility which characterises uncivilised society, and which believers in a state of nature love to encourage at all times. The division of labour, while it carries us ever farther from barbarism, makes us more dependent on each other. An Odysseus is master of many arts, a Themistocles of two, a Demosthenes of only one. A Norwegian peasant can do more for himself than an English countryman, and therefore makes a better colonist. If we must return to Nature, our first step should be to learn a number of trades, and so be better able to shift for ourselves. Such was the ideal of Hippias, and it was also the ideal of the eighteenth century. Its literature begins with Robinson Crusoe, the story of a man who is accidentally compelled to provide himself, during many years, with all the necessaries of life. Its educational manuals are, in France, Rousseau��s ��mile; in England, Day��s Sandford and Merton, both teaching that the young should be thrown as much as possible on their own resources. One of its types is Diderot, who learns handicrafts that he may describe them in the Encyclop��die. Its two great spokesmen are Voltaire and Goethe, who, after cultivating every department of literature, take in statesmanship as well. And its last word is Schiller��s Letters on Aesthetic Culture, holding up totality of existence as the supreme ideal to be sought after.