It is quite certain that under either of these conditions a much larger quantity of merchandize would be sold immediately. Many would purchase on the spot who could never return for that purpose, or who were on the point of leaving London, and much trouble would be saved to a large class of purchasers. The effect of the purchases made in the earlier days of the Exposition, would act as so many advertisements to attract visitors on the succeeding days; some articles thus purchased would probably be sent into the country by friends, and others be taken home by visitors, and many additional country visitors would thus be attracted before the end of the season. Another and a very important advantage would also accrue from such an arrangement. The manufacturers acquire their knowledge of the demand for their productions from the factors and agents; these again from the shopkeepers who sell by retail to the public. Under the proposed circumstances, this knowledge would be acquired much more rapidly, and in the course of the first two or three weeks the opinion of the public would be known upon all the articles of most popular demand. § Upon the whole, the best plan seems to be that the rule should be— “Every article must have its price attached.” The exception should be exemptions granted by officers of the Commission, and the ground of those exemptions should be stated on the respective articles. At the Exposition at Paris, in 1849, the general rule was that upon each article its price should be marked. Certain exceptions occurred, and in two instances the writer of these pages wishing to purchase specimens, although assisted most willingly by M. Le Dieu, the indefatigable head of the management always present on the spot, was unable, after some correspondence and much inquiry, to purchase or obtain samples of the objects he desired. § Perhaps the best way of complying with the rules of the Commissioners, and yet giving the public what they tacitly admit the public will demand, would be that the exhibitor should fix on each of his articles, in a conspicuous manner, a letter or a number,[9] and that he should have on the printed bill or card of address all the corresponding numbers or letters, and opposite to each the price at which it was to be sold at his warehouse or place of business. Each expositor might have a quantity of these addresses hung up or placed upon his stall, with an indication to the public that they were at liberty to take away these cards or bills. It may be worth while to make a few observations on the reasons which probably influenced and misled the Commission on so important a point.