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THREE:One pair each of three and one-half inch and five inch compasses, two ruling pens, two pairs of spring dividers, one for pens and one for pencils, a triangular boxwood scale, a common rule, and a hard pencil, are the essential instruments for machine-drawing. At the beginning, when "scratching out" will probably form an item in the work, it is best to use Whatman's paper, or the best roll paper, which, of the best manufacture, is quite as good as any other for drawings that are not water-shaded.On passing from the ultimate elements of matter to those immense aggregates which surpass man in size and complexity as much as the atoms fall below him, but on whose energies his dependence is no less helpless and complete��the infinite worlds typified for us by this one system wherein we dwell, with its solid earthly nucleus surrounded by rolling orbs of light��Lucretius still carries with him the analogies of life; but in proportion to the magnitude and remoteness of the objects examined, his grasp seems to grow less firm and his touch less sure. In marked contrast to Plato, Aristotle, and the Stoics, he argues passionately against the ascription of a beneficent purpose to the constitution of the world; but his reasonings are based solely on its imperfect adaptation to the necessities of human existence. With equal vigour he maintains, apparently against Aristotle, that the present system has had a beginning; against both Aristotle and Plato that, in common with all systems, it will have an end��a perfectly true con111clusion, but evidently based on nothing stronger than the analogies of vital phenomena. And everywhere the subjective standpoint, making man the universal measure, is equally marked. Because our knowledge of history does not go far back, we cannot be far removed from its absolute beginning; and the history of the human race must measure the duration of the visible world. The earth is conceived as a mother bringing forth every species of living creature from her teeming bosom; and not only that, but a nursing mother feeding her young offspring with abundant streams of milk��an unexpected adaptation from the myth of a golden age. If we no longer witness such wonderful displays of fertility, the same elastic method is invoked to explain their cessation. The world, like other animals, is growing old and effete. The exhaustion of Italian agriculture is adduced as a sign of the world��s decrepitude with no less confidence than the freshness of Italian poetry as a sign of its youth. The vast process of cosmic change, with its infinite cycles of aggregation and dissolution, does but repeat on an overwhelming scale the familiar sequences of birth and death in animal species. Even the rising and setting of the heavenly bodies and the phases of the moon may, it is argued, result from a similar succession of perishing individuals, although we take them for different appearances of a single unalterable sphere.207