M. le Hardy de Beaulieu adds that he could cite numerous examples of lands abandoned or sold at a nominal price by their owners, either because they had exhausted and rendered them unproductive by an unintelligent culture, or because they had not been able to withstand the competition of more fertile soils, recently brought into cultivation or brought nearer the common centre of consumption by a considerable reduction in the expense of transport. We do not contest this fact, of which the exactness may be verified any day in the increase or diminution of the value of property induced by the various changes brought about either in the grouping of the population, in the modes of culture, or in the means of transport. There are, however, few lands completely abandoned; to find examples, we should probably have to go back to those fatal times when by force of conquest proprietors were removed or all their means of culture and production were suddenly seized. But we do not see how this can help the argument of M. le Hardy de Beaulieu. It has small relation, it seems to us, to the question of property in inventions, that—perpetual by law, as long as labour continues and renews it—landed property should sometimes come to an end by occurrences or violence such as we have been speaking of. However, to state all our thoughts on the subject of landed property, we must confess (and here may be seen in all its clearness the radical difference between placing under culture, or cropping land, and working an idea), the vindication of property is found in the fact that land can only be cultivated by one at a time, must be subject to one will, and under one direction. It would be to my injury and the injury of the entire community that Peter should be allowed to plant potatoes in the field where Paul has already sowed wheat, or that James should open a quarry where John has built a house, and so on. As we have already said, the power of the lever, the laws of gravity, those of the expansion of steam, the attraction of the magnet, the caloric of coal, the facility of traction imparted by the wheel, the optical properties of glass, &c., may be utilised to the great profit of all, in a thousand different ways, by a thousand individuals at once, without the efforts of any one being diminished, hindered, obstructed, or lessened, as to their useful result, except by the beneficent laws of competition.