Another plan, mentioned in the first edition of this work, was, to have collections of the produce and manufactures exhibited on the present occasion. Few applications of the building would be more appropriate, and scarcely any could be more useful, than this. Fortunately, the Executive Committee have undertaken the task, and it cannot be doubted that the exhibitors will willingly lighten their labour by giving every assistance in their power. One or two suggestions may here be offered, for the purpose of impressing on the exhibitors at future Expositions the great importance of attaching to each object a brief and condensed account of facts connected with it. In the article of raw materials there will not be much difficulty, as there are many instances of excellence in that department. The case of drugs from Liverpool is a good illustration. Their price, however, is omitted, because it was forbidden. In the permanent collection, this most important element will, of course, occupy its proper place. It might also be useful to give the date of the first importation of each drug, and the first application to its various uses. The quantity, also, of the chemical element on which its use is founded contained in a given weight of the substance would, if known, be highly interesting: as, for instance, the quantity of quinine in a given weight of bark. In making a collection of machines, there is some fear of occupying a very large space without a corresponding advantage. A lace frame, making in one breadth of fifteen feet from sixty to a hundred repetitions of the same lace, would, commercially speaking, be the most advantageous; but such a frame with only ten repetitions would be more useful for instruction. The various self-acting mules, also, would easily fill a large room. Perhaps the collection might be confined to working models: these might be made, from time to time, to replace the larger machines, and funds for that purpose might be derived from the payments of the visitors both to the exhibition and to the lectures which ought to be given to explain the collection. In making a collection of specimens of manufactured articles, as well as of produce, it would in many cases add little to the expense if a sufficient quantity were purchased to divide into many samples. Thus, the collections of foreign countries and of our own cities might be enriched by authentic specimens. This view applies more particularly to collections of woven fabrics. A well authenticated collection of cotton, flax, wool, and silk, in the raw state, through all their successive stages of manufacture, up to the woven fabrics of which they constitute the basis, if accompanied by the prices of each at intervals of ten years during the last century, would furnish materials of the most valuable kind, and would greatly aid the economist, the statesman, and the philosopher, in discovering and putting to the test the principles connected with their several inquiries.