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THREE:CHAPTER III. ENGINEERING AS A CALLING.But the enthusiasm for science, however noble in itself, would not alone have sufficed to mould the Epicurean philosophy into a true work of art. The De Rerum Natura is the greatest of all didactic poems, because it is something more than didactic. Far more truly than any of its Latin successors, it may claim comparison with the epic and dramatic masterpieces of Greece and Christian Europe; and that too not by virtue of any detached passages, however splendid, but by virtue of its composition as a whole. The explanation of this extraordinary success is to be sought in the circumstance that the central interest whence Lucretius works out in all directions is vital rather than merely scientific. The true heroine of his epic is not Nature but universal life��human life in the first instance, then the life of all the lower animals, and even of plants as well. Not only does he bring before us every stage of man��s existence from its first to its last hour106 with a comprehensiveness, a fidelity, and a daring unparalleled in literature; but he exhibits with equal power of portrayal the towered elephants carrying confusion into the ranks of war, or girdling their own native India with a rampart of ivory tusks; the horse with an eagerness for the race that outruns even the impulse of his own swift limbs, or fiercely neighing with distended nostrils on the battlefield; the dog snuffing an imaginary scent, or barking at strange faces in his dreams; the cow sorrowing after her lost heifer; the placid and laborious ox; the flock of pasturing sheep seen far off, like a white spot on some green hill; the tremulous kids and sportive lambs; the new-fledged birds filling all the grove with their fresh songs; the dove with her neck-feathers shifting from ruby-red to sky-blue and emerald-green; the rookery clamouring for wind or rain; the sea birds screaming over the salt waves in search of prey; the snake sloughing its skin; the scaly fishes cleaving their way through the yielding stream; the bee winging its flight from flower to flower; the gnat whose light touch on our faces passes unperceived; the grass refreshed with dew; the trees bursting into sudden life from the young earth, or growing, flourishing, and covering themselves with fruit, dependent, like animals, on heat and moisture for their increase, and glad like them:��all these helping to illustrate with unequalled variety, movement, and picturesqueness the central idea which Lucretius carries always in his mind.

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THREE:Machines and tools operating by percussive action, although they comprise a numerous class, and are applied in nearly all mechanical operations, have never received that amount of attention in text-books which the importance of the machines and their extensive use calls for. Such machines have not even been set off as a class and treated of separately, although the distinction is quite clear between machines with percussive action, and those with what may be termed direct action, both in the manner of operating and in the general plans of construction. There is, of course, no lack of formul? for determining the measure of force, and computing the dynamic effect of percussive machines acting against a measured or assumed resistance, and so on; but this is not what is meant. There are certain conditions in the operation of machines, such as the strains which fall upon supporting frames, the effect produced upon malleable material when struck or pressed, and more especially of conditions which may render percussive or positive acting machines applicable to certain purposes; but little explanation has been given which is of value to practical men.

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