2. When these have been determined, the chief engineer to whom the investigation of the proposed line has been confided, with the Ordnance map in his hand, walks and re-walks over the whole length (Mr. Robert Stephenson, in his investigation of the proposed line between London and Birmingham, walked upwards of twenty times over the country between each), until he feels that he carries in his mind the whole picture; and while he is thus imagining and making out various lines for consideration, his assistants are testing the eligibility of each by rapidly taking for him what are called “flying levels,” as also “cross levels,” along the principal ridges that at various angles intersect the proposed line, and yet, notwithstanding the accuracy of these mathematical precautions, it is almost invariably found that the eye of the chief engineer has intuitively selected the best line. It is, however, as painful to reflect on, as it is humiliating to record, the prejudices, ignorance, passions, and artifice by which our principal engineers were opposed, or rather by which they were consecutively thwarted in the calm scientific investigations for the benefit of the public which we have just described. Instead of a general desire on the part of the community to hail with gratitude, and to receive with open arms, an invention which was practically not only to enable them with double elbow-room, and at about half fares, to travel at four or five times the speed which by their utmost efforts they had previously been enabled to attain, but to afford similar facilities to millions of tons of manufactures and merchandize, much of which had either been impeded by delay, or altogether clogged by the heavy charges on their transit, our engineers, in tracing the lines for our great arterial railways, were but too often looked upon as magicians, evil genii, or unclean spirits, whose unearthly object was to fright the land from its propriety. In many instances where it was proposed, by tapping the dull stagnant population of a country town, to give vigour and animation to its system, the inhabitants actually fancied that their interests and their happiness would, like their habits, expire under the operation.