Such is the _Exposicion_, such the experience, and such the views of a patriotic and enlightened corporation, representing and ruling over one of the most populous, wealthy, and industrially disposed districts of Spain. Our object in prefacing at this length, and with seeming irrelevance, perhaps, our review of the commercial policy of Russia, with its bearings on the interests of Great Britain, is to show the differing action of the same commercial system, in the present case of the prohibitive and restrictive system in different countries, both in respect of the mode in which the internal progress and industry of countries acting upon the same principle are variously affected themselves and in respect of the nature and extent of the influences of such action upon those relations of interchange which they entertain, or might otherwise entertain, with other countries where an opposite or modified system prevails. In its broad features the system of Russia varies from that of Spain only in being more rigorous and intractable still. Both, however, are founded on the same exclusive principle, that of isolation--that of forcing manufactures at whatever cost--that of producing all that may be required for domestic consumption--of exporting the greatest possible maximum--of importing the lowest conceivable minimum. Starting from the same point, and for the same goal, it will not be without interest or instruction to accompany and observe the progress of the one, as we have already endeavoured to illustrate the fortunes of the other--to present Russia, industrial and commercial, side by side, or in contrast with Spain, as we have described her. Your absolute theory men, your free-traders with one idea, like Lord Howick, your performers in the economic extravaganza now rehearsing in the Parliament-house under the style of "leave imports free, and the exports will take care of themselves," may chance to meet with many strange facts to confound their arbitrary theorems on the banks of the Neva. Absolute of wisdom, however, as they arrogate to be, and casehardened as they are, against assaulting results which should destroy their self-willed principle--a principle, like the laws of the Medes and Persians, proclaimed to be unchanged and unchangeable--in face of which facts are powerless and adverse experience contumeliously scouted, or mendaciously perverted, it is sufficiently obvious that lessons in political economy will, less than from any quarter of the globe, perhaps, be accepted from St Petersburg--they will fall upon unwilling ears--upon understandings obtuse or perverted.