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THREE:8. The expense of the appliances of distribution and their maintenance.Designing, or generating the plans of machinery, may be considered the leading element in engineering manufactures or machine construction, that one to which all others are subordinate, [75] both in order and importance, and is that branch to which engineering knowledge is especially directed. Designing should consist, first, in assuming certain results, and, secondly, in conceiving of mechanical agents to produce these results. It comprehends the geometry of movements, the disposition and arrangement of material, the endurance of wearing surfaces, adjustments, symmetry; in short, all the conditions of machine operation and machine construction. This subject will be again treated of at more length in another section. FORE:"We have in vain visited our municipal representatives. The last of them, Alderman Schmidt, who was prevented134 from fulfilling his office, surrendered to us the municipal power on August 30th.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.