We pursue this topic no further at present. We fearlessly assert--we believe that we have shown--that as much intellect has been scientifically expended in elucidating and perfecting the various operations of rural life, by which those magnificent cattle have been produced by art, as has gone to the elaboration of that wonderful wave-subduing ship. The vulgar mind, awed by bulk and sound, and visible emblems of thought, may dissent--may say that we have not so much to show for it. But the laws of life are sought for and studied--they are not made by science. The Deity has forbidden human skill to develop a sheep into an elephant. Living materials, as we have said, are not plastic like wood and iron; and to change the constitution and character of a breed of animals may require as great and as long-continued an exercise of inventive thought as to perfect an imposing piece of machinery. The real worth of a scientific result is the amount of mind expended in arriving at it, as the real height of an animal in the scale of organisation is measured by the proportionate size of its brain. But we have our more palpable and sense-satisfying triumphs too. Look at that wide valley, with its snow-clad summits at a distance on either hand, and its glassy river flowing, cribbed and confined, in the lowest bottom. Smiling fields, and well-trimmed hedge-rows, and sheltering plantations, and comfortable dwellings, and a busy population, and abundant cattle, cover its undulating slopes. For miles industrious plenty spreads over a country which the river formerly usurped, and the lake covered, and the rush tufted over, and bog and mossy heath and perennial fogs and drizzling rains rendered inhospitable and chill. But mechanics has chained the river, and drained the lakes, and bogs, and clayey bottoms; and giving thus scope to the application of all the varied practical rules to which science has led, the natural climate has been subdued, disease extirpated, and rich and fertile and happy homes scattered over the ancient waste. Turn to another country, and a river flows deeply through an arid and desolate plain. Mechanics lifts its waters from their depths, and from a thousand artificial channels directs them over the parched surface. It is as if an enchanter's wand had been stretched over it--the green herbage and the waving corn, companied by all the industries of rural life, spring up as they advance. Another country, and a green oasis presents itself, busy with life, in the midst of a desert and sandy plain. Do natural springs here gush up, as in the ancient oasis of the Libyan wilderness? It is another of the triumphs of human industry, guided by human thought. Geology, and her sister sciences, are here the pioneers of rural life and fixed habitations. The seat of hidden waters at vast depths was discovered by her. Under her directions mechanics has bored to their sources, and their gushing abundance now spreads fertility around.